摘要
对连续光源石墨炉原子吸收测定土壤中的镉的实验条件进行优化,最终确定用盐酸-硝酸-氢氟酸-过氧化氢四酸法进行消解,选择0.1%的硝酸钯作为基体改进剂,灰化分两步进行,温度分别为300℃、450℃,保持时间分别为20 s、40 s,原子化温度为1 550℃,保持时间为3 s。研究表明,此方法测定土壤中的镉标准曲线的相关系数为0.999 9,方法检出限为0.006 mg/kg,相对标准偏差为5%～11%,加标回收率为85%～94%,对质控样的分析结果与标准值吻合。
The experimental conditions for determination of cadmium in soil by continuum source graphite furnace atomic absorption were optimized. The final determination was to use hydrochloric acid-nitric acid-hydrofluoric acid-hydrogen for digestion, 0.1% of Palladium nitrate as a collective modifier, the ash was carried out in two steps, the optimum pyrolysis temperature were 300 ℃ and450 ℃, and the retention times were 20 s and 40 s, respectively, the atomization temperature was 1 550 ℃, and the retention time was 3 s. Studies had shown that the correlation coefficient of cadmium standard curve in soil measured by this method was 0.999 9, the detection limit of the method was 0.006 mg/kg, and the relative standard deviation was from 5% to 11%, and the recovery for the samples was from 85%～94%. The analysis results of the quality control samples were consistent with the standard value.
引文
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