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硫脲的用途很广,但有致癌性。目前国内外采用阴极溶出法测定硫脲的报导很少。Smyth和Osteryoug采用脉冲阴极溶出法测定了农药和尿中1ng/ml的硫脲。但对于如何排除S~(2-)对硫脲的干扰文中并未提及。本文使用普通极谱仪,先后比较了不同碱性溶液中测定硫脲的灵敏度,最后选定了二乙胺为最佳底液。在该底液中硫脲的测定灵敏度较高,线性范围较宽。S~(2-)的干扰用通氮吹气法排除。本法适用于水和尿中硫脲的测定。
Thiourea is widely used, but carcinogenic. At present, there are few reports about the determination of thiourea by cathodic dissolution at home and abroad. Smyth and Osteryoug determined 1 ng / ml thiourea in pesticides and urine using pulsed cathodic dissolution. However, there is no mention on how to rule out the interference of S ~ (2-) on thiourea. This article uses a common polarographic instrument, has compared the sensitivity of thiourea in different alkaline solution, and finally selected diethylamine as the best bottom solution. Thiourea in the bottom of the determination of high sensitivity, wide linear range. S ~ (2-) interference by nitrogen blowing excluded. This Law applies to the determination of thiourea in water and urine.