乙二胺四丙酸修饰的MCM-41的合成及其对 水中铜离子的吸附研究

目的合成介孔材料MCM-41-(CH_2)_3NH_2-EDTP,并初步研究其对水中铜离子吸附性能。方法以硅酸钠作为硅源,十六烷基三甲基溴化铵(CTAB)作为结构模板剂,在碱性条件下,利用水热法合成了纯硅源的MCM-41介孔分子筛。用3-氨丙基三乙氧基硅烷(APTES)和正硅酸乙酯(TEOS)对MCM-41介孔分子筛进行功能化修饰,成功得到了氨丙基修饰的MCM-41。将其与乙二胺四丙酸(EDTP)反应制得了MCM-41-(CH_2)_3NH_2-EDTP。采用X射线粉末衍射(XRD)和傅里叶红外光谱(FT-IR)表征手段对合成的新型功能化介孔材料进行表征。结果结果表明,MCM-41-(CH_2)_3NH_2-EDTP成功合成,乙二胺四丙酸改性的MCM-41对铜离子的吸附量明显高于纯MCM-41的吸附量。结论乙二胺四丙酸的成功嫁接使介孔材料在吸附性方面有很大提高,在水安全检测方面有很好的应用前景。     

功能介孔材料NTA-MCM-41对农药恶霉灵的 吸附研究

目的合成功能材料NTA-MCM-41并研究其对农药恶霉灵的吸附性能。方法采用两步嫁接法先后用3-氨基三甲氧基硅烷和氨基三乙酸对纯硅源的MCMC-41介孔分子筛进行功能化修饰得到新型材料NTA-MCM-41,利用正交试验方法找到其对恶霉灵吸附的最优条件。对其等温吸附曲线以及动力学数据进行拟合确定其热力学吸附方式和动力学吸附形式。通过对比实验比较功能化材料与非功能化材料的好处。结果研究结果表明,功能化后的材料对恶霉灵的吸附有明显的提高,恶霉灵的最优吸附条件为初始浓度5 mg/m L,吸附温度70℃,吸附时间9 h。功能化材料吸附恶霉灵的等温吸附曲线符合弗莱特利希(Freundlich)模型,吸附动力学符合一级反应方程。作为吸附剂的再生能力也非常好。经过五次循环吸附后,对恶霉灵的去除率仍然达到50%以上。结论氨基三乙酸的成功嫁接使介孔材料在吸附性方面有很大提高,在食品安全检测方面有很好的应用前景。     

单环刺螠体壁多糖的组成分析及基于MCM-41的吸附富集研究

本文通过胃蛋白酶酶解法提取了单环刺螠体壁多糖,进行了组成分析,并从吸附动力学、吸附热力学的角度,研究了介孔材料MCM-41对多糖的吸附。组成分析结果显示,多糖中总糖含量为（78.82%±1.40%）,蛋白含量为（10.5%±1.07%）,硫酸根含量为（0.52%±0.06%）;单糖组成分析结果显示,多糖主要由葡萄糖、甘露糖、半乳糖和木糖等单糖组成。红外光谱分析结果显示,多糖中含有O-H、C-O-C、C=O、S=O等特征基团,说明单环刺螠体壁多糖中含有糖醛酸组分,且存在硫酸基的取代。利用平均孔径为3.85 nm、孔容1.25 cm3/g的介孔材料MCM-41对单环刺螠体壁多糖进行富集,吸附量达到350 mg/g,吸附动力学符合准二级吸附动力学（pseudo second order adsorption kinetics,PSO）模型,吸附过程由外部扩散和颗粒内扩散控制。Langmuir和Freundlich模型均能够较好拟合吸附热力学,说明MCM-41的吸附过程主要为单分子层并伴随着多分子层的吸附。研究了不同洗脱剂的洗脱效果,发现10% SDS具有相对较强的洗脱能力。单环刺螠体壁多糖在介孔材料上的吸附研究有望为食品产业中含糖物质的富集分离提供指导。     

介孔材料的双功能化修饰及降低卷烟烟气中氰化氢的性能

为开发选择性吸附卷烟烟气中氰化氢的滤嘴添加剂,对水热合成法制备的有序介孔氧化硅材料MCM-41进行了碱性基团和过渡金属离子双功能化修饰,表征了功能化材料的孔结构、孔径分布、孔体积、比表面积以及元素组成等,考察了材料制备条件对吸附氰化氢性能的影响,评价了材料在卷烟滤嘴中的应用效果。结果表明:①采用N-(β-氨乙基)-γ-氨基丙基甲基二甲氧基硅烷(EPDMS)和过渡金属离子修饰后的MCM-41材料,仍保持了二维六方孔道结构以及较高的比表面积与孔体积;②EPDMS用量为4 mL/(g MCM-41)、金属离子为Zn2+时,所制备的MCM-41双功能化材料Zn2+/c-EPDMS/MCM-41的氰化氢吸附性能最好;③将上述条件下制备的Zn2+/c-EPDMS/MCM-41以二元复合滤棒的形式、20 mg/支的添加量应用于卷烟后,主流烟气HCN选择性降低31.2%,卷烟危害性指数(H)下降0.4。所制备的MCM-41双功能化材料Zn2+/c-EPDMS/MCM-41具有良好的氰化氢选择性吸附性能。      

Competition for sorption and degradation of chlorinated ethenes in batch zero-valent iron systems

The sorption and degradation of the chlorinated ethenes tetrachloroethene (PCE, 5 mg L(-1)) and trichloroethene (TCE, 10 mg L(-1)) were investigated in zero-valent iron systems (ZVI, 100 g L(-1)) in the presence of compounds common to contaminated groundwater with varying physicochemical properties. The potential competitors were chlorinated ethenes, monocyclic aromatic hydrocarbons, and humic acids. The effect of a complex matrix was tested with landfill contaminated groundwater. Nonlinear Freundlich isotherms adequately described chloroethene sorption to ZVI. In the presence of the more hydrophobic PCE (5 mg L(-1)), TCE sorption and degradation decreased by 33% and 30%, respectively, while TCE (10 mg L(-1)) decreased PCE degradation by 30%. In the presence of nonreactive hydrophobic hydrocarbons (i.e., benzene, toluene, and m-xylene at 100 mg L(-1)), TCE and PCE sorption decreased by 73% and 55%, respectively. The presence of the hydrocarbons had no effect on TCE degradation and increased PCE reduction rates by 50%, suggesting that the displacement of the chloroethenes from the sorption sites by the aromatic hydrocarbons enhanced the degradation rates. Humic acids did not interfere significantly with chloroethene sorption or with TCE degradation but lowered PCE degradation kinetics by 36% when present at high concentrations (100 mg L(-1)). The landfill groundwater with an organic carbon content of 109 mg L(-1) C had no effect on chloroethene sorption but inhibited TCE and PCE degradation by 60% and 70%, respectively.     

Controlled release of allyl isothiocyanate from brown algae Laminaria japonica and mesoporous silica MCM-41 for inhibiting food-borne bacteria

Allyl isothiocyanate (AITC), a naturally occurring antimicrobial compound, is an effective inhibitor of various pathogens, but its use in the food industry is limited by its volatility and pungency. The objective of this study was to overcome the volatility of AITC using dried Laminaria japonica and mesoporous silica MCM-41 as its carrier. AITC-loaded L. japonica (raw and deoiled) powder and silica MCM-41 was achieved via vapor adsorption. The study of AITC adsorption and desorption was determined by monitoring sample weight changing with time. AITC presence in L. japonica and MCM-41 samples was confirmed by FTIR spectroscopy. Antimicrobial tests were made against 4 microorganisms: Bacillus cereus, Staphylococcus aureus, Escherichia coli, and Salmonella Typhimurium. Controlled release and antimicrobial activity from MCM-41 was always superior to those from raw and deoiled L. japonica.     

Transformation of aromatic ether- and amine-containing pharmaceuticals during chlorine disinfection

Many of the human pharmaceuticals detected in municipal wastewater effluent, surface water, and groundwater contain functional groups that could undergo transformation reactions during chlorine disinfection. To assess the potential importance of these reactions to the environmental fate of pharmaceuticals, the rate of transformation of a group of compounds was measured over a pH range of 5-10. Several of the pharmaceuticals reacted rapidly with free chlorine (i.e., HOCl/OCl-) and would be expected to undergo transformation under the conditions typically encountered in many chlorine disinfection systems. For compounds containing aromatic ether functional groups, the rate of transformation was strongly affected bythe other substituents on the ring. The amine-containing pharmaceuticals underwent a rapid reaction with hypochlorous acid to form chlorinated amines, which could be converted back into the parent compound by reaction with thiosulfate. In the absence of thiosulfate, the chlorinated amines slowly decomposed to form species that could not be converted back into the parent compound. The reaction rates of the pharmaceuticals with combined chlorine (i.e., chloramines) were significantly slower, and transformation of the compounds would not be expected under the conditions encountered during chloramination.     

改性介孔材料对贝类副产物中重金属离子的脱除性能

为研究改性介孔材料对贝类副产物中重金属离子的脱除性能,对SBA-15介孔材料分别嫁接2-巯基噻唑啉、2-巯基苯并噻唑、吡咯烷二硫代氨基甲酸铵三种不同基团,得到三种材料分别记作MT-SBA-15、MBT-SBA-15、APDC-SBA-15,然后对材料孔结构进行表征,采用三种材料吸附铅(Pb)、铬(Cr)、镉(Cd)、铜(Cu)标准溶液,考察脱除pH、脱除时间、金属离子加标浓度对脱除能力的影响,最后用APDC-SBA-15脱除贝类副产物中重金属离子,考察重金属脱除率以及营养损失率。结果表明,三种材料都具有较大的比表面积和孔容。三种材料对重金属最优脱除pH为6.0,吸附平衡时间均为30 min;当金属离子浓度为1200 mg/L时,三种材料对金属离子吸附量最大,其中APDC-SBA-15的吸附量最高,对Pb、Cr、Cd、Cu吸附量分别为223.6、240.0、259.8、259.0 mg/g。APDC-SBA-15对菲律宾蛤仔蒸煮液中Pb的脱除率为100.00%,总糖损失率为7.32%;对菲律宾蛤仔蒸煮液多糖中Pb脱除率为84.50%,总糖损失率为2.57%;对牡蛎多肽中Pb、Cr的脱除率分别为62.20%和100.00%,对可溶性蛋白质的损失率为14.62%。综上,APDC-SBA-15可以高效脱除贝类副产物中的重金属,对蛋白质、总糖等营养成分的损失率较低。     

Changes in interfacial tension of chlorinated solvents following flow through U.K. soils and shallow aquifer material

The interfacial tension (IFT) that arises at the interface between water and an immiscible organic liquid is a key parameter affecting the transport and subsequent fate of the organic liquid in water-saturated porous media. In this paper, data are presented that show how contact between a range of soil types and chlorinated hydrocarbon solvent (CHS) dense nonaqueous phase liquids (DNAPLs) can affect DNAPL/water IFT values. The soils examined are indicative of U.K. soil types and shallow aquifer materials. The solvents investigated were tetrachloroethylene (PCE) and trichloroethylene (TCE). Lab grade, recovered field DNAPL and industrial waste chlorinated solvent mixtures were used. The data from batch and column experiments invariably revealed that water/DNAPL IFT values change following contact with unsaturated soils. In the majority of cases, the IFT values increase following soil exposure. However, after contact with an organic-rich soil, the IFT of the lab grade solvents decreased. The experimental evidence suggests that these reductions are linked to the removal of organic material from the soil and its subsequent incorporation into the solvent IFT increases in the case of lab solvents are shown to be linked to the removal of stabilizers (added by the manufacturers to obviate degradation) that are removed by adsorption to soil mineral surfaces. Similarly, it is conjectured that adsorption of surface-active compounds from the industrial waste samples to soil surfaces is responsible for increases in the IFT in these samples. Finally, it was observed that invading CHSs are capable of dissolving and subsequently mobilizing in-situ soil contaminants. GC/MS analysis revealed these mobilized soil contaminants to be polyaromatic hydrocarbons and phthalate esters.     

Different catalytic effects by copper and chromium on the formation and degradation of chlorinated aromatic compounds in fly ash

Fly ash from municipal solid waste incineration may catalytically enhance the formation and degradation of chlorinated aromatic compounds. The activities of three Deacon catalysts in this process were investigated in a statistically designed experiment. Chlorides of copper, chromium, and nickel were added to fly ash samples and the resulting samples heated at 300 degrees C for 2 h in an air atmosphere. The addition of copper increases the formation of all chlorinated aromatic compounds except the low chlorinated congeners of polychlorinated dibenzo-p-dioxins and dibenzofurans. The addition of chromium decreased the formation of most chlorinated aromatic compounds except the highest chlorinated species, where it was without effect. The addition of nickel did not show any significant effect. The outcome of the experiment can be interpreted as two competing processes: the chlorination of aromatic rings and the oxidation of carbon-carbon and carbon-oxygen bonds. The delicate balance between chlorination and oxidation could probably be further exploited to minimize both the emissions and the net production of chlorinated aromatic compounds from combustion.     

Secondary organic aerosol formation from aromatic precursors. 1. Mechanisms for individual hydrocarbons

Quantitative kinetic and physical phase partitioning models of secondary organic aerosol (SOA) formation resulting from the reactions of aromatic species were integrated into a mechanism for gas-phase reactions. Using the resulting model, analyses of the sensitivity of SOA formation to several parameters (e.g., VOC/NOx ratio, rate parameters) were performed. Results indicated that aerosol yield (SOA formed per amount of hydrocarbons reacted) depends on the extent of conversion of parent hydrocarbons, partitioning coefficient, initial aerosol mass concentration, and rate parameters. On the basis of the sensitivity studies, models for SOA yield were developed for 11 aromatic compounds. Comparison of the results from current SOA models to the results from this study suggests that mechanisms describing SOA formation from aromatic species must incorporate the reactions of reactive intermediates.     

Laboratory measurements of thermodynamics of adsorption of small aromatic gases to n-hexane soot surfaces

The adsorption isotherms of a series of aromatic hydrocarbons on n-hexane soot were measured as a function of temperature and partial pressure in a coated-wall flow tube coupled to an electron-impact mass spectrometer. The specific surface area was determined for each of the samples by measuring the BET isotherm of Kr at 77 K. The gas-to-surface uptakes were fully reversible with the extent of adsorption increasing with decreasing temperature and increasing partial pressures. At low partial pressures, the isotherms were well modeled by the Langmuir isotherm for all experimental conditions, and the adsorption was found to saturate at one monolayer of coverage at approximately 2 x 10(14) molecule cm(-2). For the less volatile species, evidence for multilayer adsorption was observed and the BET isotherm was used instead. The experimental enthalpies of adsorption were consistently higher than the enthalpies of vaporization for all compounds. A linear free-energy relationship was developed between the Langmuir equilibrium constant for adsorption and the compound's (sub-cooled) liquid vapor pressure, providing validation for the use of such relationships in assessing gas-particle partitioning of aromatic hydrocarbons to soot aerosols in the environment. The experimental results were compared to the Junge-Pankow gas-to-aerosol partitioning model.     

Adsorption of polycyclic aromatic hydrocarbons by carbon nanomaterials

Carbon nanomaterials are novel manufactured materials, having widespread potential applications. Adsorption of hydrophobic organic compounds (HOCs) by carbon nanomaterials may enhance their toxicity and affect the fate, transformation, and transport of HOCs in the environment. In this research, adsorption of naphthalene, phenanthrene, and pyrene onto six carbon nanomaterials, including fullerenes, single-walled carbon nanotubes, and multiwalled carbon nanotubes was investigated, which is the first systematic study on polycyclic aromatic hydrocarbons (PAHs) sorption by various carbon nanomaterials. All adsorption isotherms were nonlinear and were fitted well by the Polanyi-Manes model (PMM). Through both isotherm modeling and constructing "characteristic curve", Polanyi theory was useful to describe the adsorption process of PAHs by the carbon nanomaterials. The three fitted parameters (Q0, a, and b) of PMM depended on both PAH properties and the nature of carbon nanomaterials. For different PAHs, adsorption seems to relate with their molecular size, i.e., the larger the molecular size, the lower the adsorbed volume capacity (Q0), but higher a and b values. For different carbon nanomaterials, adsorption seems to relate with their surface area, micropore volume, and the volume ratios of mesopore to micropore. Quantitative relationships between these sorbent properties and the estimated parameters of PMM were obtained. These relationships may represent a first fundamental step toward establishing empirical equations for quantitative prediction of PAH adsorption by carbon nanomaterials and possibly other forms of carbonaceous (geo-) sorbents, and for evaluating their environmental impact. In addition, high adsorption capacity of PAHs by carbon nanotubes may add to their high environmental risks once released to the environment, and result in potential alteration of PAHs fate and bioavailability in the environment.     

顶空固相微萃取-气相色谱-质谱联用法分析黄茶香气成分

建立黄茶香气的分析方法,探讨固相微萃取技术在黄茶香精油制备上的应用,研究固相微萃取头种类、温度、吸附和解吸时间对黄茶香气物质种类和总量的影响。结果表明：采用DVB-CAR-PDMS 固相微萃取头,在80℃下吸附1h,能达到最佳吸附效果;吸附的香气物质在GC-MS 进样口内经230℃热脱附1min,共检测出108 种黄茶香气成分,其物质种类由高到低依次为烃类32 种、酯类20 种、醇和醛类各17 种、酮类8 种、含氧和含氮化合物各4 种、酸类3 种、含硫化合物2 种、酚类1 种;其含量以脂肪族烃、醛类较多,而萜烯类以及芳香族化合物较少。     

Efficient approach for Cd2+ and Ni2+ removal and recovery using mesoporous adsorbent with tunable selectivity

Cadmium pollution from the manufacture and disposal of NiCd batteries remains an important problem in developing countries. Among the available remedial technologies, adsorption is popular because of its low cost and simplicity. The mesoporous NH2-MCM-41 displays good adsorption capacities for cadmium and nickel ions. This work demonstrated for the first time the use of the competition between complexant and sorbentto create high adsorption selectivity. The selectivity was manipulated by the judicious use of a chelating agent, thus achieving on-demand 100% selectivity for either Cd2+ or Ni2+ adsorption. Single and binary components adsorption studies, carried out with different metals and EDTA concentrations, solution compositions and pH, showed that NH2-MCM-41 adsorbs only cadmium with a capacity of 0.56 mmol g(-1) from binary mixtures at [EDTA]/[M2+] = 0.5 and pH 5. The NH2-MCM-41 displays 100% selectivityfor nickel adsorption at [EDTA]/[M2+] = 0.5 and pH 2 with a measured adsorption capacity of 0.50 mmol g(-1). Pure Cd2+ and Ni2+ solutions were recovered by a simple acid wash, and the regenerated adsorbent could be reused without lost of performance (i.e., adsorption capacity and selectivity).     

MCM-41固定化柚苷酶脱苦葡萄柚汁

以介孔分子筛MCM-41为载体,戊二醛为交联剂,采用吸附-交联法进行了柚苷酶的固定化。研究了酶液浓度、戊二醛浓度、吸附交联时间和固定化pH对固定化效果的影响,对影响固定化效果的因素进行了分析。确定最佳的固定化条件为:酶液浓度为0.4mg/mL,戊二醛浓度2.0%,吸附交联时间为6h,固定化pH为4.0(醋酸缓冲液)。采用海藻酸钠和聚乙烯醇对制备的固定化酶进行二次包埋处理,并应用于葡萄柚汁的脱苦。结果显示,游离酶和MCM-41固定化酶对果汁的脱苦率分别为96.65%和92.90%,海藻酸钠和聚乙烯醇二次固定化的柚苷酶脱苦率分别为72.64%和70.90%。脱苦后的果汁营养成分与理化指标均有一定程度降低。为柚苷酶的固定化提供了一种新型的载体材料,为固定化柚苷酶在果汁脱苦中的工业化应用提供了理论基础。     

Comparative oxidation and net emissions of methane and selected non-methane organic compounds in landfill cover soils

The surface emissions of methane (CH4) and non-methane organic compounds (NMOCs) were determined at two different areas at a French landfill: a permanently covered and fully vegetated area (40 cm coarse sand + 80 cm of loam) and a temporarily covered area (40 cm of coarse sand). The 37 NMOCs quantified in the landfill gas samples included alkanes (C1-C10), alkenes (C1-C4), halogenated hydrocarbons (including (H)CFCs), and aromatic hydrocarbons. Both positive and negative CH4 fluxes ranging from -0.01 to 0.008 g m(-2) d(-1) were measured from the permanently covered cell. However, high spatial variation was observed, and a hot spot with a high flux (10 g m(-2) d(-1)) was identified. A higher CH4 emission occurred from the temporarily covered cell (CH4 flux of 49.9 g m(-2) d(-1)) as compared to the permanently covered cell. The NMOC fluxes from the permanently covered zone were all very small with both positive and negative fluxes in the order of 10(-7) to 10(-5) g m(-2) d(-1). Higher and mainly positive NMOC fluxes in the order of 10(-5) to 10(-4) g m(-2) d(-1) were obtained from the temporarily covered zone. The lower emission from the permanently covered and fully vegetated cell was attributable to the thicker soil layer, which functions as microbial habitat for methanotrophic bacteria. The NMOC oxidation capacity was investigated in soil microcosms incubated with CH4. Maximal oxidation rates for the halogenated aliphatic compounds varied between 0.06 and 8.56 microg (g of soil)(-1) d(-1). Fully substituted hydrocarbons (tetrachloromethane, perchloroethylene, CFC-11, CFC-12, and CFC-113) were not degraded in the presence of CH4 and O2. Benzene and toluene were rapidly degraded, giving very high maximal oxidation rates (28 and 39 microg (g of soil)(-1) d(-1)). On the basis of the emission measurements and the batch experiments conducted, a general pattern was observed between emissions and biodegradability of various NMOCs. The emissions mainly consisted of compounds that were not degradable or slowly degradable, while an uptake of easily degradable compounds was registered. As an example, perchloroethylene, trichloromethane, CFC-11, and CFC-12 were emitted, while atmospheric consumption of aromatic hydrocarbons and lower chlorinated hydrocarbons such as vinyl chloride, dichloromethane, and chloromethane was observed. This study demonstrates that landfill soil covers show a significant potential for CH4 oxidation and co-oxidation of NMOCs. Under certain conditions, landfills may even function as sinks for CH4 and selected NMOCs, like aromatic hydrocarbons and lower chlorinated compounds.     

Modeling maximum adsorption capacities of soot and soot-like materials for PAHs and PCBs

Recent studies have shown that not partitioning but adsorption is the main mechanism for sorption of hydrophobic organic compounds to soot and soot-like materials. For compounds that adsorb by van derWaals forces only, variation in soot-water distribution coefficients will result from differences in these forces for adsorption, as well as the maximum number of accessible sites. This maximum number of accessible sites may a priori be expected to vary due to differences in both sorbent characteristics and sorbate dimensions. In this modeling study, variation in maximum adsorption capacities is explained from sorbent and sorbate properties. Maximum adsorption capacities were calculated using (a) literature values for soot-water distribution coefficients for polycyclic aromatic hydrocarbons and polychlorobiphenyls on 10 different soot and soot-like materials and (b) Langmuir affinities for adsorption at a carbonaceous surface estimated using a recently reported method. The variation in maximum adsorption capacities could be explained by the variation in sorbent specific surface area, sorbent organic carbon content, and the sorbent-sorbate contact area. Furthermore, increasing sorbate thickness was related to a decrease in maximum adsorption capacities, which points to adsorption in micropores. Maximum adsorption capacities decreased by 1-2 orders of magnitude as the contact area increased by 50%. This points to adsorption sites being hardly larger than sorbates.     

介孔分子筛搭载槲皮素食品抗氧化活性包装膜制备及其性能研究

以十六烷基三甲基溴化铵(CTAB)和聚(乙二醇)-block-聚(丙二醇)-block-聚(乙二醇)Mn~2900(P131345)作为双模板剂制备出纳米二氧化硅介孔分子筛MCM-41(Mobil Composition of Matter No.41),并进一步以此为载体搭载天然抗氧化剂槲皮素,以低密度聚乙烯(LDPE)为基材制备了一种食品抗氧化活性包装膜。结果表明,所制备纳米二氧化硅介孔分子筛MCM-41比表面积为439.173 m2/g,孔体积为0.665 cm3 g-1,孔径分布为2.4、4.0 nm。吸附槲皮素后,其1,1-二苯基-2-三硝基苯肼(DPPH)自由基在经过24 h和1200 h后平均清除率分别为56.75%和66.01%。同时,槲皮素在食品模拟物中的扩散速率D(cm2/s)由2.127×10-13下降到3.089×10-14。表明以介孔分子筛为载体制备的食品抗氧化活性包装膜具备抗氧化的作用并具备缓释性。     

Changes in flavor compounds of dry-cured Chinese Jinhua ham during processing

Sixty experimental Jinhua hams were processed by a traditional method using green hams from local Liangtouwu cross-bred pigs. Samples of Biceps femoris were taken from five hams randomly at each of the key stages of production, i.e., green ham, end of salting, end of sun-drying, middle of loft-aging, end of loft-aging, post-aging-1 and post-aging-2. Analysis of flavor compounds showed 89 compounds at the green ham stage and at the end of salting, 90 at the end of sun-drying, 91 at the middle of loft-aging, 96 at the end of loft-aging, 93 at the post-age-1 and 94 at the post-age-2. The flavor compounds could be clustered in the following chemical families: alkanes and alkenes, aromatic hydrocarbons, alcohols, aldehydes, ketones, carboxylic acids, esters, oxygenous heterocycle compounds, nitrogenous compounds, sulphur compounds, chloride compounds, amides, and terpenes. During processing, the concentrations of aldehydes and carboxylic acids increased; while the concentrations of alcohols, ketones, alkanes, alkenes, aromatic and cyclic hydrocarbons decreased. Sulphur compounds and pyrazines were formed and increased continuously during processing. In the final Jinhua ham, the contents of aldehydes, carboxylic acids, alcohols and ketones were 45.07%, 18.39%, 13.93% and 9.00% of the total flavor substances, respectively. The first principal component was a group dominated by five unbranched aldehydes; the second principal component was a group dominated by five branched and unbranched alcohols, two branched ketones, toluene, hexane and 4-nitrophthalamide. The two principal components explained 90.6% of the total flavor variance in Jinhua ham.