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1.
ICP-MS法测定纺织品中痕量重金属的研究   总被引:4,自引:0,他引:4  
研究了微波消解样品,试液用ICP-MS法同时测定样品中Pb、As、Cd、Cr、Ni等重金属元素.对影响其测量的各种因素进行了较为详细的研究,确定了实验的最佳测定条件.结果表明,方法的检出限为0.001-0.008μg/L.回收率为93.17%~109.12%,RSD小于3.42%.该法准确、快速、简便,应用于纺织品中重金属元素的测定,结果满意.  相似文献   

2.
电感耦合等离子体质谱测定纺织品中部分重金属含量   总被引:1,自引:0,他引:1  
将试样用模拟人体酸性汗液充分萃取后,采用电感耦合等离子体质谱仪(ICP-MS)测定了纺织品中砷、铬、铜、汞、铅5种重金属元素的残留量。结果表明相对标准偏差为2.12%~11.20%,加标回收率为80.0%~96.1%。  相似文献   

3.
采用ICP-AES法测定4种罐头食品模拟物中的有害重金属铅、铬、镉、汞,并建立了10%乙醇模拟液和橄榄油模拟液的微波消解的方法,方法的回收率82.5%~99.6%之间,相对标准偏差为1.85%~6.51%,检出限在0.001mg/L到0.003mg/L以及0.01mg/kg到0.03mg/kg之间。该方法准确度高、简单、易操作,是测定罐头食品包装模拟物中有害重金属元素的有效方法。  相似文献   

4.
ICP-MS同时测定土壤中Cr、Ni、Cu、As、Tl和Pb   总被引:5,自引:0,他引:5  
建立起HNO3-H2O2-HF体系微波消解前处理样品,利用电感耦合等离子体质谱(ICP—MS)同时测定土壤中的铬(Cr)、镍(Ni)、铜(Cu)、砷(As)、铊(Tl)、铅(Pb)6种重金属元素含量的方法。该方法的相关系数在0.9996~1.000,相对标准偏差在0.669%~3.02%,加标回收率为94.68%~115.5%,检出限为2.004~312.4ng/L,结果表明该方法满足重金属分析的要求。用建立起的方法测定了来自湖南、湖北、云南、贵州、河南、福建、辽宁7个省45个产区烟田土壤中的Cr、Ni、Cu、As、田和Pb6种重金属元素含量;与对应烟叶中的6种重金属含量相比,聚类分析结果表明不同省区间土壤中的重金属含量无明显差异,而烟叶中却差异明显。  相似文献   

5.
纺织品样品经酸汗液萃取后,以全谱直读ICP—AES法对萃取液中Pb、Cd、As、Cu、Co、Ni、Cr、Sb等重金属进行同时测定,该方法的相对标准偏差0.87%~8.25%,各元素的加标回收率为80.4%~1059/5,该方法准确、可靠,可满足日常检测的需要。  相似文献   

6.
本研究建立了 ICP -MS 在线内标法测定葡萄酒中铁(Fe)、锌(Zn)、铜(Cu)、铬(Cr)、铅(Pb)、锡(Sn)6种重金属元素的方法,采用微波消解对6种元素的前处理方法及ICP-MS工作参数进行了优化。线性范围0~50μg/L 及0~5000μg/L,方法检出限均优于0.2μg/L,回收率在88.6%~109.8%,相对标准偏差RSD均小于6.0%。采用该方法对葡萄酒样品进行了分析,结果表明该方法能够满足重金属痕量检测需求。  相似文献   

7.
采用微波消解法处理广藿香,利用火焰原子吸收法测定广藿香中Mn、Zn、Fe、Mg、Ca5种矿物质元素,利用石墨炉原子吸收测定Cu,Pb,As3种重金属的含量。结果表明,广藿香中Mn、Zn、Fe、Mg、Ca、Cu、Pb、As含量分别为10.88μg/g、17.33μg/g、233.87μg/g、856.32μg/g、1213.41μg/g、3.68μg/g、0.42μg/g、0.18μg/g。本方法简单、准确,方法加标回收率为98.8%~105.0%,相对标准偏差为0.42%~1.96%。  相似文献   

8.
研究纺织品中重金属含量的检测方法,分别使用干法灰化法和微波消解法这两种预处理方法对样品进行了重金属含量的测定,通过分析比较两种方法测得的重金属含量,改进了干法灰化法,以硝酸镁作灰化剂加速样品的氧化,减少待测元素的挥发损失。测试结果表明,该法测试结果与微波消解法接近,且具有成本低、操作简便的特点,有较高的实用性,可用于日常纺织品重金属含量的检测。  相似文献   

9.
建立了微波消解.电感耦合等离子体质谱法测定甘蔗中25种元素的方法。确定了微波消解和电感耦合等离子体质谱仪的测量参数,该方法对各元素的检出限0.00090-6.19μg/g,相对标准偏差0.3%~2.5%,适用于甘蔗中多种元素的同时测定。  相似文献   

10.
林鋆 《中国纤检》2012,(14):60-62
本文采用带八级杆碰撞反应池系统(Octopole Reaction System)的电感耦合等离子体质谱仪(ICP-MS),建立了一套完整、快速检测纺织品中可萃取重金属元素的半定量方法。对样品进行半定量分析和加标回收试验,结果表明:该套方法可以有效地消除干扰,实现对纺织品中多种可萃取重金属的快速检测,测定结果与实际标准溶液的偏差在10%以内,加标回收率为86.2%~104.2%。  相似文献   

11.
Since grapevine ( Vitis spp .) rootstock material is being traded increasingly as disbudded woody material a lack of distinctive morphological features on such material necessitates an alternative and reliable means of identification. Methods described here were developed for rapid and efficient extraction of DNA from woody samples rich in phenolic compounds and polysaccharides, and for subsequent identification of varieties by RAPD PCR. Using these methods, and with the application of only one selected RAPD primer, we were able to differentiate sixteen rootstock varieties, including the seven varieties most commonly used in Germany. Problems commonly encountered with reproducibility of RAPD patterns were avoided by choosing primers with a dinucleotide sequence and a high G/C content that allowed a rather high annealing temperature of 45°C. Methods described here should also be useful for other horticultural crops, especially those with woody tissues rich in phenolic compounds and polysaccharides.  相似文献   

12.
An internet website (http://cpf.jrc.it/smt/) has been produced as a means of dissemination of methods of analysis and supporting spectroscopic information on monomers and additives used for food contact materials (principally packaging). The site which is aimed primarily at assisting food control laboratories in the European Union contains analytical information on monomers, starting substances and additives used in the manufacture of plastics materials. A searchable index is provided giving PM and CAS numbers for each of 255 substances. For each substance a data sheet gives regulatory information, chemical structures, physico-chemical information and background information on the use of the substance in particular plastics, and the food packaging applications. For monomers and starting substances (155 compounds) the infra-red and mass spectra are provided, and for additives (100 compounds); additionally proton NMR are available for about 50% of the entries. Where analytical methods have been developed for determining these substances as residual amounts in plastics or as trace amounts in food simulants these methods are also on the website. All information is provided in portable document file (PDF) format which means that high quality copies can be readily printed, using freely available Adobe Acrobat Reader software. The website will in future be maintained and up-dated by the European Commission's Joint Research Centre (JRC) as new substances are authorized for use by the European Commission (DG-ENTR formerly DGIII). Where analytical laboratories (food control or other) require reference substances these can be obtained free-ofcharge from a reference collection housed at the JRC and maintained in conjunction with this website compendium.  相似文献   

13.
The characterization of the aromatic profile of several apricot cultivars with molecular tracers in order to obtain objective data concerning the aromatic quality of this fruit was undertaken using headspace–solid phase microextraction (HS–SPME). Six apricot cultivars were selected according to their organoleptic characteristics: Iranien, Orangered, Goldrich, Hargrand, Rouge du Roussillon and A4025. The aromatic intensity of these varieties measured by HS–SPME–Olfactometry were defined and classified according to the presence and the intensity of grassy, fruity and apricot like notes. In the six varieties, 23 common volatile compounds were identified by HS–SPME–GC–MS. Finally, 10 compounds, ethyl acetate, hexyl acetate, limonene, β-cyclocitral, γ-decalactone, 6-methyl-5-hepten-2-one, linalool, β-ionone, menthone and (E)-hexen-2-al were recognized by HS–SPME–GC–O as responsible of the aromatic notes involved in apricot aroma and considered as molecular tracers of apricot aromatic quality which could be utilized to discriminate apricot varieties.  相似文献   

14.
The advent of the functional barrier concept in food packaging has brought with it a requirement for fast tests of permeation through potential barrier materials. In such tests it would be convenient for both foodstuffs and materials below the functional barrier (sub-barrier materials) to be represented by standard simulants. By means of inverse gas chromatography, liquid paraffin spiked with appropriate permeants was considered as a potential simulant of sub-barrier materials based on polypropylene (PP) or similar polyolefins. Experiments were performed to characterize the kinetics of the permeation of low molecular weight model permeants (octene, toluene and isopropanol) from liquid paraffin, through a surrogate potential functional barrier (25 μm-thick oriented PP) into the food simulants olive oil and 3% (w/v) acetic acid. These permeation results were interpreted in terms of three permeation kinetic models regarding the solubility of a particular model permeant in the post-barrier medium (i.e. the food simulant). The results obtained justify the development and evaluation of liquid sub-barrier simulants that would allow flexible yet rigorous testing of new laminated multilayer packaging materials.  相似文献   

15.
16.
A 9% whey protein (WP) isolate solution at pH 7.0 was heat-denatured at 80°C for 30 min. Size-exclusion HPLC showed that native WP formed soluble aggregates after heat-treatment. Additions of CaCl2 (10–40 mM), NaCl (50–400 mM) or glucono-delta-lactone (GDL, 0.4–2.0%, w/v) or hydrolysis by a protease from Bacillus licheniformis caused gelation of the denatured solution at 45°C. Textural parameters, hardness, adhesiveness, and cohesiveness of the gels so formed changed markedly with concentration of added salts or pH by added GDL. Maximum gel hardness occurred at 200 mM NaCl or pH 4.7. Increasing CaCl2 concentration continuously increased gel hardness. Generally, GDL-induced gels were harder than salt-induced gels, and much harder than the protease-induced gel.  相似文献   

17.
Capillary electrophoresis (CE) and polarized light microscopy (PLM) were utilized in the detection of the adulteration of locust bean gum with guar gum. For CE analyses, standards of locust bean and guar gums were extracted with 30% CH3CN, removing the residual proteins from the gum matrix. A 8.75 mM NaH2PO4-20.6 mM Na2B4O7 buffer, pH 9, was used to separate these proteins and to identify marker proteins that were present in the guar gum. These markers did not co-migrate with components in the extracts of mechanically processed locust bean gum, and are used as indicators of adulteration. Using PLM with toluidine blue and iodine staining techniques, unadulterated locust bean gum samples were distinguished from mixed samples through the differential staining of components in locust bean versus guar and tara gums. These experiments in the use of CE and PLM provide orthogonal and complementary methods for the verification of 'true' positives and the elimination of 'false' positives.  相似文献   

18.
19.
This paper describes the second part of a project undertaken to develop certified mussel reference materials for paralytic shellfish poisoning toxins. In the first part two interlaboratory studies were undertaken to investigate the performance of the analytical methodology for several PSP toxins, in particular saxitoxin and decarbamoyl-saxitoxin in lyophilized mussels, and to set criteria for the acceptance of results to be applied during the certification exercise. Fifteen laboratories participated in this certification study and were asked to measure saxitoxin and decarbamoyl-saxitoxin in rehydrated lyophilized mussel material and in a saxitoxin-enriched mussel material. The participants were allowed to use a method of their choice but with an extraction procedure to be strictly followed. The study included extra experiments to verify the detection limits for both saxitoxin and decarbamoyl-saxitoxin. Most participants (13 of 15) were able to meet all the criteria set for the certification study. Results for saxitoxin.2HCl yielded a certified mass fraction of <0.07 mg/kg in the rehydrated lyophilized mussels. Results obtained for decarbamoyl-saxitoxin.2HCl yielded a certified mass fraction of 1.59+/-0.20 mg/kg. The results for saxitoxin.2HCl in enriched blank mussel yielded a certified mass fraction of 0.48 +/- 0.06 mg/kg. These certified reference materials for paralytic shellfish poisoning toxins in lyophilized mussel material are the first available for laboratories to test their method for accuracy and performance.  相似文献   

20.
BADGE.2HCl and BFDGE.2HCl were determined in 28 samples of ready-to-drink canned coffee and 18 samples of canned vegetables (10 corn, 5 tomatoes and 3 others), all from the Japanese market. HPLC was used as the principal analytical method and GCMS for confirmation of relevant LC fractions. BADGE.2HCl was found to be present in one canned coffee and five samples of corn, BFDGE.2HCl in four samples of canned tomatoes and in one canned corn. No sample was found which exceeded the 1mg/kg limit of the EU for the BADGE chlorohydrins. However the highest concentration was found for the sum of BFDGE.2HCl and BFDGE.HCl.H2O at a level of 1.5mg/kg. A Beilstein test confirmed that all cans containing foods contaminated with BADGE.2HCl or BFDGE.2HCl had at lest one part coated with a PVC organosol.  相似文献   

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