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长期吸入空气中少量的碘化亚铊,将引起中枢神经系统等疾患,并会有毛发脱落,湿疹、呕吐和腹泻等症状。故一般规定厂房空气中铊的最高容许浓度为0.01毫克/米~3。为了检测空气中微量碘化亚铊的浓度,我们研究了灵敏且简便的二甲酚橙比色法,由试验确定了以王水加热氧化一价铊为三价铊的条件;试剂的适宜用量为1.0-1.5毫升;采用3个串联的冲击式采样管以保证浓度在1毫克/米~3以上铊的吸收完全。本法最小捡出量为1微克,可以满足现场捡测分析的要求。同时亦适用于空气中硫酸亚铊和其它三价铊盐的测定。方法简介如下: 分析方法: 1.校正曲线的绘制:分别吸取铊(Ⅰ)标准溶液(应用105℃干燥2小时的碘化亚铊溶于吸收
Long-term inhalation of the air in a small amount of thallium iodide, will cause diseases such as the central nervous system, and there will be hair loss, eczema, vomiting and diarrhea and other symptoms. Therefore, the general provisions of plant air thallium maximum allowable concentration of 0.01 mg / m ~ 3. In order to detect the concentration of trace thallium iodide in the air, we studied the sensitive and simple xylenol orange colorimetric method, and determined the conditions for the oxidation and oxidation of monovalent thallium to trivalent thallium with aqua regia. The suitable amount of reagent For the 1.0-1.5 ml; using three in series impact sampling tube to ensure that the concentration of 1 mg / m ~ 3 above thallium absorption completely. The minimum amount of this Law is 1 microgram, which can meet the requirements of on-site survey and analysis. It is also suitable for the determination of thallous sulfate and other trivalent thallium salts in the air. The method is described as follows: Analytical methods: 1. The calibration curve drawing: Draw respectively Thallium (Ⅰ) standard solution (105 ℃ drying 2 hours of thallium iodide dissolved in absorption