GF-AAS法测定处理污水灌溉土壤中铅最佳基体改进剂的选择及其应用

研究了石墨炉原子吸收法（GF-AAS法）测定一级处理污水灌溉土壤中铅最佳基体改进剂的选择及在最佳改进剂条件下测定污水灌溉土壤中铅的GF-AAS法。试验了磷酸二氢铵, 磷酸铵, 氯化铵, Pd-Mg和磷酸二氢铵+硝酸镁+硝酸铵等基体改进剂对测定一级处理污水灌溉土壤铅的基体改进作用，并根据基体改进剂的改进效果，最佳灰化温度和原子化温度, 选定了最佳基体改进剂和测定条件。40 g·L-1的磷酸二氢铵作为基体改进剂，灰化温度为850 ℃，原子化温度为1 600 ℃时，用氘灯校正背景GF-AAS法进行测定，测定方法的RSD为2.6% ，回收率在92.4%～104%之内。

Selection of Matrix Modifier for GF-AAS Determination of Trace Lead in Soil Watered with Waste Water and Its Application

The rapid and direct method of selection of the matrix modifier for the determination of trace lead in soil watered with waste water by graphite furnace atomic absorption spectrometry under the best matrix modifier selected has been developed. The effect of the matrix modifiers including NH4 Hz2PO4, (NH4)3PO4, NH4CI, Pd-Mg, NH4H2PO4+MgNO3+NH4NO3 etc. was determined by using graphite furnace atomic absorption spectroscopy. The results showed that NH4H2PO4 is the best matrix modifier for the determination of lead in soil watered with waste water, and the content of lead was determined by using 4.0 mg x L(-1) NH4H2PO4 as a matrix modifier, ashing and atomization temperature of 850 degrees C and 1600 degrees C, respectively, and rectifying background. The relative standard deviation of the method was 2.6%, and the recovery was in the range of 92.4%-104%.