电感耦合等离子发射光谱测定硫铁矿中的铁、硫、铜、锌、砷、铅

试样用过氧化钠熔融分解,用ICP-AES法同时测定硫铁矿中的铁、硫、铜、锌、砷、铅。尝试一次性处理样品同时做多元素的分析测试。     

原子吸收法测定高纯氧化铝、石英和粘土、长石中氧化铁、氧化钙和氧化镁

陶瓷材料中氧化铁、氧化钙和氧化镁等化合物,应用原子吸收分光光度法测定,已有报导[1,2]。对于氧化铝的分析是用高压釜盐酸分解试样,通入氯化氢气体,使基体铝以Al_2O_3·6H_2O沉淀除去,加入氯化锶释放剂消除剩余的铝对钙镁测定的干扰。这样,对高纯氧化铝的分析,能减少污染,降低空白值,但高压釜造价较高,溶解试样时间很长,操作烦琐。我们减少称样量,用碳酸钠(如需测定钾和钠,则改加碳酸锂)熔融法分解试样,5%盐酸浸出,加入氯化锶释放剂,直接测定高纯氧化铝中的氧化铁、氧化钙和氧化镁。用氢氟酸——高氯酸驱除石英、粘土和长石中的硅,并且二次用高氯酸蒸干驱尽二氧化硅和氢氟酸,用5%盐酸溶解盐类,加入氯化锶释放剂,直接测定石英、粘土和长石中的氧化铁、氧化钙和氧化镁,均能获得满意的结果。     

硅酸盐陶瓷原料、坯料、釉料快速系统分析——银坩埚熔样,硅、铁、铝、钛、钙、镁不分离系统分析

方法提要在银坩埚中,用氢氧化钾高温熔融分介试样,用稀盐酸提取熔块。所制得的试液可用于硅、铁、铝、钛、钙、镁的全部测定。分析流程表:     

铬铁中铬、硅、磷、镍、锰的快速分析

铬铁经常分析的除碳硫外,有铬、硅、磷等项目。镍锰在必要时才进行测定。低碳铬铁能溶解于盐酸、稀硫酸和过氯酸的混合酸中,但高碳铬铁很难溶解于酸中,必须以过氧化钠熔融。以往进行这些元素的测定时,采用重量法及容量法,但手续繁复,费时亦长。若按过氯酸法进行,既不经济、而又只能局限于单独分析。我们用过氧化钠熔融试样,在一份试样中测定铬、硅、磷、镍、锰五元素。铬的测定,不需再加任何氧化剂就直接用亚铁盐滴定,其他均采用比色法。本法二人合作能在20分钟内完成测定。如单独测定铬,能在15分钟内完成。     

等离子发射光谱法测定钒铁中的铜、硅、铝、磷、铬、镍、钨、锰

叙述采用等离子发射光谱法同时测定钒铁中的铜、硅、铝、磷、铬、镍、钨、锰等微量元素 ,试样用稀王水分解 ,选择适当的波长与背景校正进行分析测定 ,方法回收率在 95%～ 1 0 5%之间 ,相对标准偏差均小于 4% ,本方法快速准确 ,精密度良好。     

ICP—AES测定钒—锆蓝陶瓷颜料中的钒、铝、钛

本文叙述了试样用碳酸钠-硼砂熔融,稀盐酸浸取后即枯直接用ICP-AES法测定钒、铝、钛,测定结果与化学法相吻合。     

矾土中钾、钠、硅、铁、钙、镁、钛的ICP-AES测定

以碳酸锂-四硼酸锂为熔剂,铝矾土试样经高频融样机高温熔融。熔融物在PTFE烧杯中,用稀盐酸加热溶解。样品溶液使用电感耦合等离子体原子发射光谱仪测定,结果准确度高、重复性好。     

矿渣、粉煤灰和硅灰对硬化水泥浆体孔隙率的影响

本文用3种不同的试样制备方法和3种测孔方法分别测定了加矿渣、粉煤灰和硅灰等掺合料的硬化水泥浆体孔隙率。结果表明,试样制备方法和孔隙率测定方法一样,都会影响孔隙率的测定结果,掺加掺合料以后,这种影响更为显著。     

火焰原子吸收光谱法定量测定铁矿石中的Cu、Pb、Zn

试样经盐酸-硝酸-氢氟酸-高氯酸四酸溶解,盐酸复溶作介质,用火焰原子吸收光谱法连续测定矿石中Cu、Pb、Zn三种元素,研究了基体干扰及消除方法,对铁矿石标准物质进行测定,测定值与认定值一致,符合检测方法要求。     

ICP-AES分析低合金钢中的Mn、Mo、V、Ni、Al、Cu、Cr元素

用等离子发射光谱法测定低合金钢中的Mn、Mo、V、Ni、Al、Cu、Cr元素,试样用HNO3和HCl在加热条件下分解,经过系列试验,选择仪器的工作条件,进行测定,建立了一套分析方法,经对照分析,分析结果令人满意。本方法快速准确,精密度良好,完全可以满足生产需要。     

Updated Atom/Functional Group and Atom_Code Volume Additivity Parameters for the Calculation of Crystal Densities of Single Molecules,Organic Salts,and Multi‐Fragment Materials Containing H,C, B,N, O,F, S,P, Cl,Br, and I

Data for crystal structures with ≤10 fragments per asymmetric unit from the Cambridge Structural Database were used to update and extend our previously described databases. Atom and functional group volumes and densities were determined for organic compounds with the elements H, C, B, N, O, F, P, S, Cl, Br, I, and halide anions. The datasets included organic ions and multi‐fragment structures. Linear and nonlinear volumes and linear densities were determined for 109 predefined atoms/functional groups from ∼41000 crystal structure data. An updated volume database for atom_codes, which are automatically defined by the atoms and their connections in a dataset, was determined in separate calculations with 2805 atom_codes defined for ∼48000 structures. The atom_code extension to 6‐coordinate C and B allowed carboranes to be modeled. The average percent difference between the observed and calculated densities is about 2%.     

滴定法快速测定多金属矿石中的铜铅锌铁

采用盐酸、硝酸、硫酸等试剂分解试样,铅形成硫酸铅沉淀,过滤洗涤使硫酸铅沉淀与铜、锌、铁等金属离子分离,沉淀加NaAc-HAc缓冲液溶解,用EDTA标准液滴定测铅.滤液以水定容至100mL,用移液管分别分取2份部分溶液,1份溶液用碘量法测定铜.另1份溶液加过量氨水使锌离子与铁离子等分离,过滤洗涤,滤液用EDTA标准液滴定...     

Synthesis,characterization, and antimicrobial activity of acrylic copolymers

2,4‐Dichlorophenyl methacrylate (2,4‐DMA) and vinyl acetate (VAc) were copolymerized with different feed ratios using dimethyl formamide (DMF) as a solvent and 2,2′‐azobisisobutyronitrile (AIBN) as an initiator at 70°C. The copolymers were characterized by infrared (IR) spectroscopy. Copolymer compositions were determined by ultraviolet (UV) spectroscopy. The monomer reactivity ratios were evaluated by the Fineman–Ross method. Average molecular weight and polydispersity index were determined by gel permeation chromatography (GPC), and the intrinsic viscosities of polymers were also discussed. Thermogravimetric analyses of polymers were carried out under a nitrogen atmosphere. The homo‐ and copolymers were tested for their antimicrobial activity against selected microorganisms. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 895–900, 2003     

火焰原子吸收光谱法测定污水处理厂污泥中Pb、Cd、Cr、Ni含量

采用空气-乙炔火焰原子吸收光谱法测定污水处理厂污泥中Pb、Cd、Cr、Ni的含量。研究了灰化温度、灰化时间、消解加酸量对不同金属吸光度的影响。在最佳工作条件下,4种元素标准曲线相关性较好(r=0.997 0～0.999 8),样品加标回收率为96.0%～106.5%,测定结果准确可靠。得出了不同季节生活污泥中Pb、Cd、Cr、Ni含量变化规律。     

Functional copolymers of p‐cumyl phenyl methacrylate and glycidyl methacrylate: Synthesis,characterization, and reactivity ratios

Free‐radical polymerization of p‐cumyl phenyl methacrylate (CPMA) was performed in benzene using bezoyl peroxide as an initiator at 80°C. The effect of time on the molecular weight was studied. Functional copolymers of CPMA and glycidyl methacrylate (GMA) with different feed ratios were synthesized by free‐radical polymerization in methyl ethyl ketone at 70°C, and they were characterized by FTIR and ¹H‐NMR spectroscopy. The molecular weights and polydispersity indexes of the polymers and copolymers were determined by gel permeation chromatography. The copolymer composition was determined by ¹H‐NMR. The glass‐transition temperature of the polymer and the copolymers was determined by differential scanning calorimetry. The reactivity ratios of the monomers were determined by the Fineman–Ross and Kelen–Tudos methods. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 336–347, 2005     

Isolation and structure determination of cassumunarins A,B, and C: New anti-inflammatory antioxidants from a tropical ginger,Zingiber cassumunar

New antioxidants, cassumunarins A, B, and C, were isolated from the rhizomes ofZingiber cassumunar, and the structures were determined by spectroscopic methods to be complex curcuminoids. The antixidant efficiency of cassumunarins was determined by inhibitory activity of autoxidation of linoleic acid in a buffer-ethanol system. The anti-inflammatory effect was measured by inhibition of edema formation on mouse ear induced by 12-O-tetradecanoylphorbol-13-acetate. Both types of activities were stronger for the cassumunarins than for the curcumin. Visiting scholar at University of Texas (October 1992–September 1993).     

电感耦合等离子体原子发射光谱法测定稀土硅铁中的镧、铈、镨、钕

建立了不经分离用电感耦合等离子体原子发射光谱法,直接测定稀土硅铁中镧、铈、镨、钕的方法。样品经盐酸-硝酸-氢氟酸溶解,高氯酸冒烟除硅。在盐酸介质中,于优化选定的仪器条件下,测定镧、铈、镨、钕。测定回收率均在98%~101%之间,相对标准偏差均小于0.5%,该法操作简便,分析快速,结果准确可靠。     

微波消解ICP-AES法测定润滑油中的铁,镍,铜,锌,硼,磷

通过微波消解处理润滑油,ICP法测定润滑油中铁,镍,铜,锌,硼等元素,通过正交实验进行微波消解条件优化,并进行了精密度实验,标准样品的回收率为98%以上,相对标准偏差小于1%。     

Electrorheological properties of kaolinite,polyindole, and polyindole/kaolinite composite suspensions

In this study, polyindole (PIN) and polyindole/kaolinite (PIN/KAO) composite were synthesized by free radical polymerization using FeCl₃ as an initiator. Average particle sizes (d₅₀) of PIN and PIN/KAO composite were determined by dynamic light scattering (DLS) as 7.2 and 6.2 μm, respectively. The samples were characterized by FTIR, elemental analysis, DSC/TGA and SEM measurements. Suspensions of KAO, PIN, and PIN/KAO composite were prepared in silicone oil (SO) and the sedimentation stabilities were determined. Electrorheological (ER) properties of these suspensions were studied as a function of dispersed phase concentration, shear rate, shear stress, and temperature; and yield stresses and excess shear stresses determined. Further, dielectric properties of KAO, PIN, and PIN/KAO composite were investigated. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007     

Quantitation of phosphatidyl N-methyl- and N,N-Dimethylaminoethanol in rat liver

The contents of phosphatidyl N-methyl-and N,N-dimethylaminoethanol were determined in the liver of rats injected with (Me-C¹⁴) methionine. Total phospholipids were extracted from aliquots of the liver and fractionated by two-dimensional thin layer chromatography after addition of carrier phosphatidyl-N-methyl-and N,N-dimethylaminoethanol. The radioactivity present in the two phosphatide spots was determined and used to calculated total disintegrations per min/100 g body wt. The remainder of the livers was pooled, and total phospholipids were isolated and subjected to acid hydrolysis. N-methyl- and N,N-dimethylaminoethanol were purified by thin layer chromatography, and their specific activity was determined after quantitation by gas liquid chromatography and radioactivity measurement. The liver contents of phosphatidyl N-methyl- and N,N-dimethylaminoethanol were determined by dividing disintegrations per min/100 g body wt by the specific activity of N-methyl- or N,N-dimethylaminoethanol.