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砷的毒性大小顺序为As3+>As5+>R-As-X.,有机胂作为动物抗病原微生物和促生长类饲料添加剂,在饲料中应用极为普遍。但有机胂中无机砷含量有多高,对环境的影响有多大,畜产品中砷的残留有多高等问题都无相应的检测数据加以论证。因此,了解有机胂制剂中的无机砷含量与有机胂制剂分解速度意义重大。应用液相色谱-等离子质谱联用的方法分析样品中的无机砷。采用20%(体积比)甲醇水溶液作为萃取剂,将样品进行预处理,再以5mmol/L四丁氢铵,2mmol/L丙二酸和5%(体积分数)甲醇水溶液作为流动相(pH5.9),C18色谱柱(150mm×4mmi.d.,5μm)将样品萃取液进行液相色谱分离,最后进入等离子质谱仪定量分析。测定对氨基苯胂酸和硝基羟基苯胂酸无机砷含量。
The order of the toxicity of arsenic is As3 +> As5 +> R-As-X. Organic arsine is widely used as animal anti-pathogenic microorganism and growth-promoting feed additive in feed. However, there is no corresponding test data to prove the high content of inorganic arsenic in organic arsine, how much influence it has on the environment, and how high arsenic residues in livestock products are. Therefore, it is of great significance to know the content of inorganic arsenic in organic arsine and the decomposition rate of organic arsine. Analysis of inorganic arsenic in samples by liquid chromatography-mass spectrometry. The sample was pretreated with 20% (v / v) aqueous methanol as extractant. The mobile phase was 5 mmol / L tetrabutylammonium hydroxide, 2 mmol / L malonic acid and 5% (volume fraction) aqueous methanol. 9), C18 column (150mm × 4mmi.d., 5μm) the sample extract was separated by liquid chromatography, and finally into the plasma mass spectrometer quantitative analysis. Determination of para-aminobenzenesulfonic acid and nitrohydroxybenzene arsenic acid inorganic arsenic content.