大米中无机砷测定方法的改进

改进GB/T 5009.11-2003《食品中总砷及无机砷的测定》中应用氢化物原子荧光光谱法测定无机砷的前处理方
法。结果表明：大米样品在60 ℃超声波提取35 min，上机前放置25 min后的测定结果，测定结果与国标法分析结果经配对t
检验（t=1.37，P＞0.05）表明无显著差异。该方法检出限为0.015 mg/kg，线性范围0～200 μg/L，回收率为93.8%～106.0%，相
对标准偏差为3.3%，具有简便、快速、干扰少、准确可靠等优点，适用于质检机构大批量样品的测定。

Improved Method for Determination of Inorganic Arsenic in Rice

The pretreatment method for the determination of inorganic arsenic using hydride generation atomic fluorescence
spectrometry described the Chinese national standard GB/T 5009.11-2003 “Determination of total arsenic and inorganic
arsenic in foods” was improved. The results indicated that the analytical results for rice samples extracted ultrasonically for
35 min and then allowed to stand for 25 min before injection were not significantly different from those obtained following
the national standard by pairwise t-test (t = 1.37, P ＞ 0.05). The detection limit, linear range, recovery rate and relative
standard deviation of the developed method were 0.015 mg/kg, 0–200 μg/L, and 93.8%–106.0%, respectively. This method is
characteristics of simple and fast operation, less interference and high accuracy so that it is suitable for the determination of
bulk samples in quality inspection.