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目的 建立测定水中砷的新方法 方法 用把作掩蔽剂,石墨炉原子吸收法直接测定水样中砷。仪器的工作条件:波长193.7nm;狭缝1.3nm;灯电流12.0mA;干燥80～140℃,40s;灰化1100～1200℃,20 s;原子化 2 300℃,5s;除残 2600℃,4 s。结果 线性范围10～200μg/L,加标后砷浓度为50μg/L和150μg/L的样品液,平均加标回收率在100.7％和103.6％,灵敏度可达10μg/L。标准曲线经随机作 6次重复测定,相关系数为0.995 4～0.9997,最低检出限为5μg/L。,石墨管为普通非涂层条件下,饮用水中金属离子不干扰试验,0.2％铝也不干扰测定。结论 石墨炉原子吸收法可用于测定水中砷,对较清洁水样可直接测定。
AIM: To establish a new method for the determination of arsenic in water by direct determination of arsenic in water samples by graphite furnace atomic absorption spectrometry. The instrument operating conditions: wavelength 193.7nm; slit 1.3nm; lamp current 12.0mA; drying 80 ~ 140 ℃, 40s; ashing 1100 ~ 1200 ℃, 20 s; atomization 2 300 ℃, 5s; 4 s. Results The average recoveries were 100.7% and 103.6% with the linear range of 10 ~ 200μg / L and the spiked arsenic concentrations of 50μg / L and 150μg / L respectively. The sensitivity was 10μg / L. The standard curve was randomly repeated 6 times to determine the correlation coefficient of 0.995 4 ~ 0.9997, the minimum detection limit of 5μg / L. , Graphite tube for the ordinary non-coating conditions, metal ions in drinking water does not interfere with the test, 0.2% aluminum does not interfere with the determination. Conclusion Graphite furnace atomic absorption spectrometry can be used to determine arsenic in water, which can be directly measured for cleaner water samples.