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目的建立土壤中砷的氢化物发生-原子荧光光谱法。方法用硝酸、氢氟酸、高氯酸对样品在电热板上进行湿法消解,然后将消化液加盐酸、硫脲后用5%的盐酸作载流,5g/L氢氧化钾-20g/L硼氢化钾作还原剂,原子荧光光谱法测定砷含量。结果该法的线性范围为0～50μg/L,相关系数为0.999 6,方法检出限为0.025μg/L,相对标准偏差2.21%～4.13%,回收率为90.60%～106.20%。结论原子荧光光谱法测定土壤中砷灵敏度高,准确、快捷。
Aim To establish arsenic hydride generation - atomic fluorescence spectrometry in soils. Methods The sample was wet digested on hot plate with nitric acid, hydrofluoric acid and perchloric acid. Then, the digestion solution was treated with hydrochloric acid and thiourea by 5% hydrochloric acid as the carrier, 5g / L potassium hydroxide - 20g / L potassium borohydride as reductant and atomic fluorescence spectrometry for determination of arsenic content. Results The linear range of this method was 0 ~ 50μg / L, the correlation coefficient was 0.999 6, the detection limit was 0.025μg / L, the relative standard deviation was 2.21% ~ 4.13% and the recovery was 90.60% ~ 106.20%. Conclusion The determination of arsenic in soil by atomic fluorescence spectrometry has high sensitivity, accuracy and speed.