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采用直接固体进样-石墨炉原子吸收分析技术,研究了基体改性剂、灰化温度和原子化温度对土壤中As,Cd,Zn,Sn,Hg,Pb,Cr,Cu和Mn 9种重金属含量分析的影响。当As,Cd,Zn,Sn和Hg等元素使用Pd(NO3)2+M g(NO3)2作为基体改进剂时有利于吸光度的增加,而NH4H2PO4作为基体改进剂有利于Pb,Cr,Cu和M n吸光度的增加。方法应用于国家标准物质,结果与推荐值相吻合,方法 RSD优于7.0%,各种重金属方法检出限均低于0.1223 ng。
The effect of matrix modifier, ashing temperature and atomization temperature on the adsorption and desorption of As, Cd, Zn, Sn, Hg, Pb, Cr, Cu and Mn in soils was investigated by direct solid sample injection - graphite furnace atomic absorption spectrometry Influence of content analysis. When As, Cd, Zn, Sn and Hg and other elements using Pd (NO3) 2 + M g (NO3) 2 as a matrix modifier is conducive to the increase of absorbance, and NH4H2PO4 as a matrix modifier is conducive to Pb, Cr, Cu and M n Absorbance increase. The method was applied to national standards and the results were consistent with the recommended values. The method RSD was better than 7.0%, and the detection limits of all kinds of heavy metals were less than 0.1223 ng.