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皮革污泥中总的铬用原子吸收测了,大约有13mg/g,现在想测一下在这么多的铬中,六价铬有多少。请问用什么办法处理烘干了的皮革污泥,能把六价铬最大程度的浸取出来啊,用的是分光光度计测得六价铬
2011年6月9日,日本农林水产省发布G/SPS/N/JPN/279号通报:食品卫生法实施条例及食品和食品添加剂和标准规范修订案。该修正案批准异喹啉和吡咯作为食品添加剂使用并规定此类物质的标准和规范。该草案评议截止期为2011年8月8日,此后会尽快批准和生效。更多详情参见:http://members.wto.org/crnattachments/2011/sps/JPN/11_1820_00_e.pdf
皮革及其皮革制品中五氯苯酚的检测摘要: 本文建立了皮革及其皮革制品中痕量五氯苯酚的液相色谱同位素稀释质谱联用的检测方法。以酸化后的乙腈提取皮革及其皮革制品中的残留的五氯苯酚,在ZORBAX XDB-C18柱(50mm×2.1 mm, 3.5μm)上,采用乙腈:0.5%乙酸水溶液=75:25(体积比)作为流动相进行分离,结合电喷雾电离ESI离子化技术,在负离子SIM模式下测定,进行质谱定性分析,以13C-五氯苯酚为内标物进行定量,方法的定量限为0.005μg/g,加标回收率为: (91.0~97.7)% ,重复次数n=3时,测定精密度小于5%,以信噪比(S/N)为10计算,五氯苯酚的定量限(LOQ)为0.005μg/g。方法准确、可靠,适用于皮革及其制品中痕量五氯苯酚残留的测定。关键词: 五氯苯酚;液相色谱质谱联用法;13C-五氯苯酚;皮革及其制品The Detection of Pentachlorophenol in Leatherand Leather Products Abstract: With acidified acetonitrifle as extraction,pentachlorophenol in leather and leather products was analyzed by liquidchromatography isotope dilution mass spectrometry in ZORBAX XDB-C18 column (50mm × 2.1 mm, 3.5μm). On chromatography separation step,acetonitrile and 0.5% aqueous solution of acetic acid (75:25, volume ratio) was used as the mobilephase. Combining of electrospray ionization ESI ionization technique, massspectrometry qualitative analysis was determined on the anion SIM mode. Byusing 13C-pentachlorophenolphenol as internal standard, the quantitative limit is 0.005 μg/g, the addingstandard recovery is (91.0 to 97.7)%. Keep the number of repetitions at 3, therelative standard deviation is less than 5%. If the signal-to-noise ratio (S/N)is 10, the limit of quantification (LOQ) of pentachlorophenol is 0.005μg/g. Themethod is accur