将采集的污泥样品晾干并碾碎至粒径为150 μm的细粉,置于105 ℃温度条件下烘干4 h,称取烘干的样品,用硝酸-氢氟酸-高氯酸混合酸消解后,将溶液定容至250 mL容量瓶中。分取5.00 mL试液置于100 mL容量瓶中用硝酸(0.2+99.8)溶液定容至100 mL,用火焰原子吸收光谱法按所选仪器工作条件测定其中4种重金属元素锰、铜、镉及铅的含量。方法的检出限(2s)分别为0.006 5(锰),0.001 6(铜),0.001 9(镉)及0.020 7(铅) mg·L-1。用标准加入法做回收试验,测得回收率在92.3%~98.6%之间。

Samples of sludge were air-dried, ground to size of 150 μm, and finally dried at 105 ℃ for 4 h. The dried sample was digested with mixed acid of HNO3-HF-HClO4, and the sample solution was made up to 250 mL in a volumetric flask. A aliquot of 5.00 mL was taken and diluted quantitatively to 100 mL with HNO3 (0.2+99.8) and used for FAAS determination of Mn, Cu, Cd and Pb under the prescribed conditions. Detection limits (2s) found for the 4 elements were 0.006 5, 0.001 6, 0.001 9 and 0.020 7 mg·L-1 respectively. Tests for recovery were made and the results obtained were in the range of 92.3%-98.6%.