Application of ultrasonic-assisted aqua regia extraction inthe determination of heavy metal elements in soil
LIU Ke-ke1, HUO Xian-kuan2, CHU Yan-hong1, SONG Han1, XIE Ya-xiong1, ZHANG Yan-chang3
1.High & New Technology Research Center of Henan Academy of Sciences, Zhengzhou 450002, China; 2.Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou 450001, China; 3.Henan Academy ofSciences, Zhengzhou 450002, China
Abstract：The soil samples were pretreated by ultrasound-assisted aqua regia digestion. Then the contents of ten elements (including copper, zinc, nickel, iron, manganese, lead, arsenic, mercury, chromium and cadmium) in soil sample were determined by inductively coupled plasma atomic emission spectrometry (ICP-AES) and inductively coupled plasma mass spectrometry (ICP-MS). The ultrasound-assisted extraction conditions were listed as follows: the dosage of aqua regia was 5mL, the ultrasound water bath temperature was 80℃, and the ultrasound-assisted extraction time was 45min. Under the optimized instrumental conditions, the linear correlation coefficients of calibration curves for ten elements in soil samples were between 0.9996 and 0.9999 in experiments. The detection limits of elements were between 0.0021mg/kg and 0.23mg/kg. The low limit of determination of elements varied from 0.0070mg/kg to 0.78mg/kg. The contents of copper, zinc, nickel, iron, manganese, lead, arsenic, mercury, chromium and cadmium in soil sample were determined according to the experimental method (ultrasound-assisted aqua regia extraction-ICP-AES/ICP-MS). The relative standard deviations (RSD, n=6) of determination results were between 0.39% and 7.8%. The extraction values of iron and manganese were relatively low, while the determination results of other elements were basically consistent with those obtained by national standard method (GB 15618-1995 and GB/T 22105.1-2008). The proposed method was applied for the determination of copper, zinc, nickel, manganese, lead, arsenic, mercury, chromium and cadmium in certified reference materials of soil (GBW07404, GBW07406, GBW07407 and GBW07427). Except for manganese (it mainly existed in the form of oxides in original soil, and the determination results were lower), the found results of other elements were consistent with the certified values.
刘珂珂, 霍现宽, 褚艳红, 宋寒, 谢亚雄, 张彦昌. 超声辅助-王水提取法在测定土壤中重金属元素的应用[J]. 冶金分析, 2019, 39(1): 48-53.
LIU Ke-ke, HUO Xian-kuan, CHU Yan-hong, SONG Han, XIE Ya-xiong, ZHANG Yan-chang. Application of ultrasonic-assisted aqua regia extraction inthe determination of heavy metal elements in soil. , 2019, 39(1): 48-53.
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