微波消解在土壤中总铬测定中的应用

Microwave Digestion Used in Soil Total Chromium Determination

目的建立微波消解作为测定土壤总铬的样品前处理的方法。方法土壤样品加入硝酸和氢氟酸在一定条件下微波消解,在可控电炉上加入硫酸赶酸,根据条件选用原子吸收法或二苯碳酰二肼法测定土壤中的总铬。结果经过对不同土壤及土壤标准样品的测试,平行样品测定的RSD在1.20%～11.08%之间;2个土壤标准样品测试值均在保证值内,RSD分别为2.57%和2.20%。结论微波消解作为测定土壤总铬的样品前处理的方法,重复性好,与传统方法比较,安全易控制,分析时间短,结果可靠。

Objective To develop a pretreatment method with the microwave digestion for the determination of soil total chromium. Methods The nitric acid and hydrofluoric acid were added into the samples, the microwave digestion under the certain condition was conducted and then the sulfuric acid was added on the controllable electric stove. Flame atom absorption spectrophotometry or diphenylcarbohydrazide spectrophotometry was used to determine soil total chromium according to the condition. Results RSDs were from 1.20% to 11.08%. The Environmental Soil Standard test demonstrated that the results were in the guarantee value, as for ESS-1, RSD=2.57%, as for ESS-3, RSD=2.20%. Conclusion The microwave digestion is considered as a good pretreatment method for the determination of soil total chromium with the advantages of safe, rapid and accurate.