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《化学分析计量》 2019年增刊
DOI:10.3969/j.issn.1008-6145.2019.z1.007
三酸消解-石墨炉原子吸收光谱法测定土壤中的镉和铅
昌伟宏,李建坡
北京北排水环境发展有限公司水质检测中心,北京 100022 
Determination of cadmium and lead in soil by triacid digestion-graphite furnace atomic absorption spectrometry
CHANG Weihong, LI Jianpo
Water Quality Testing Center, Beijing Drainage Water Environment Development Co., LTD., Beijing 100022, China 
摘要: 建立三酸消解-石墨炉原子吸收光谱法测定土壤中镉和铅的含量。土壤样品经盐酸-硝酸-氢氟酸 三酸消解法进行前处理,以5 g/L 磷酸氢二铵溶液为基体改进剂,采用石墨炉原子吸收光谱法测定样品溶液的 吸光度,绘制校准曲线,从校准曲线中查得镉和铅的含量。在选定的实验条件下,镉和铅的校准曲线方程分别为 y=0.120 97x+0.009 24 和y=0.005 10x+0.002 81,相关系数均为1.000,镉和铅的检出限分别为0.004,0.08 mg/kg(按称 取0.5 g 试样消解定容至50 mL 计算),均低于GB/T 17141-1997 的标准检出限。对4 种不同土壤样品进行测定,镉 和铅测定结果的相对标准偏差分别为1.5%~2.9%,1.1%~2.3%(n=8)。对3 种不同浓度的土壤样品进行加标回收试验, 镉和铅的回收率分别为98.2%~106.0%,98.0%~109.2%。该方法准确度高,精密度好,检出限低,适用性强,可用于土 壤中重金属含量的检测。  
Abstract:A method for determination of cadmium and lead contents in soil by triacid digestion-graphite furnace atomic absorption spectrometry was establish. Soil samples were pretreated by hydrochloric acid-nitric acid-hydrofluoric acid digestion method. With 5 g/L diammonium hydrogen phosphate solution as matrix modifier. The absorbance of sample solution was determined by graphite furnace atomic absorption spectrometry. Calibration curves were drawn and the contents of cadmium and lead were determined from the calibration curves. Under the selected experimental conditions, the calibration curve equations of cadmium and lead were y=0.120 97x+0.009 24 and y=0.005 10x+0.002 81, respectively, the correlation coefficients were all 1.000, and the detection limits of cadmium and lead were 0.004,0.08 mg/kg, respectively, (according to 0.5 g sample was digested and diluted to 50 mL), which were lower than the standard detection limits of GB/T 17141-1997. Cadmium and lead were measured for four different soils, and the relative standard deviation of cadmium and lead were 1.5%-2.9%, 1.1%-2.3%(n=8), respectively. The recoveries of cadmium and lead were 98.2%-106.0% and 98.0%-109.2% in the three various soil samples. This method has the advantages of accurate detection results, good precision, low detection limits, good applicability and it can be suitable for heavy metal detection in soil samples.  
关键词:石墨炉原子吸收光谱法;盐酸-硝酸-氢氟酸消解;土壤;镉;铅 
Keywords:graphite furnace atomic absorption spectrometry; hydrochloric acid-nitric acid-hydrofluoric acid digestion; soil; cadmium; lead 
本文引用格式:
昌伟宏,李建坡. 三酸消解- 石墨炉原子吸收法测定土壤中的镉和铅[J]. 化学分析计量,2019,28(Z1):32-36.
CHANG W H,LI J P. Determination of cadmium and lead in soil by triacid digestion-graphite furnace atomic absorption spectrometry[J]. Chemical analysis and meterage,2019,28(Z1):32-36. 

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