库仑滴定法快速测定砷溶液胁迫下大蒜、花生不同组织的砷吸收量

为了解砷溶液胁迫下大蒜和花生不同组织对砷吸收的特性和规律，并建立一种快速测定农产品中砷的方法，利用微波程序消解技术快速处理样品，将消解液中的As5+转化为As3+后，依据法拉第电解定律，用阳极电生的I3-进行测定，根据消耗的电量直接计算样品中砷的质量分数。结果表明：各样品自外皮至内对砷均有吸收，大蒜的平均吸收量为7.363~6.281 mg/kg，花生的平均吸收量为7.191~1.083 mg/kg，该方法重现性好，简单快速，适于农产品中元素砷的快速分析。对大蒜粉进行平行测定，相对标准偏差RSD为3.2%n=12]，回收率为98.80%~102. 80%。

Rapid determination of arsenic uptake from garlic, peanut different tissue under arsenic solution stress by Coulomb Titrimetric Method

In order to understand the rules and characteristics of arsenic uptake from garlic, peanut different tissue under arsenic solution stress, and to establish a rapid determination method of arsenic in agricultural products, microwave digestion procedure was used to process samples rapidly, As5+ was changed into As3+ in the digestion solution. According to Faraday''s law of electrolysis, anode electric I3-was determined, the mass fraction of arsenic in sample was calculated according to the power consumption directly. The results showed that:the samples from surface to inside. All tissue absorbs arsenic, the average absorption of garlic was 7.363~6.281 mg/kg, the average absorption of peanut was 7.191~1.083 mg/kg. This method was reproducible, simple, fast, and suitable for rapid analysis of elements arsenic in agricultural product . Garlic powder parallel was determined 12 times and its RSD was 3.2%(n=12), the recovery rate was 98.80%~102.80%.