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本文介绍一种灵敏而准确的方法用于测定粮食中硒。于APDC—MIBK体系中加入微克量铜或镍进行协同萃取,不仅可提高测定硒的灵敏度,而且由于生成较稳定的硒化物,可使硒的灰化温度提高到1200℃而不致挥发损失,较大程度地提高了测定硒的准确度。在涂锆石墨管中可准确测定粮食样品中0.045—0.307μg/g的硒。回收率达96—102%,相对标准偏差为3.3%,检出限为0.010μg/g硒。
This article presents a sensitive and accurate method for the determination of selenium in food. The addition of micrograms of copper or nickel to the APDC-MIBK system for synergistic extraction not only increases the sensitivity of determination of selenium, but also increases the ashing temperature of selenium to 1200 ° C without loss of volatility due to the formation of a relatively stable selenide The accuracy of determining selenium is greatly enhanced. Accurate determination of selenium in food samples coated with 0.045-0.307 μg / g in coated graphite tubes. The recovery rate was 96-102%, and the relative standard deviation was 3.3%. The detection limit was 0.010μg / g selenium.