能量色散X射线荧光光谱法对水溶液中多种重金属离子的检测方法探讨

使用小台式的能量色散X射线荧光光谱仪可以实现水溶液中多种痕量重金属离子的直接测试,不需要对溶液进行消解,且仪器简单,对环境要求低.通过对谱线能量不同的元素进行分组,对各组元素的滤光片进行选择:对于铬、锰、铁,使用0.2 mm Al滤光片;对于镍、铜、锌、铅、硒、砷、汞,使用0.5 mm Ti滤光片;对于锑,使用1.25...

Discussion on the determination method of various heavy metals in water solution by energy dispersive X-ray fluorescence spectrometry

Various trace heavy metal ions in water solution could be directly detected by a small benchtop energy dispersive X-ray fluorescence spectrometer (EDXRF) without pretreatment. Moreover, the instrument was simple and had low requirements for the environments. The elements with different spectral energy were grouped and the suitable filters for elements in each group were selected: Al filter of 0.2 mm for chromium, manganese and iron; Ti filter of 0.5 mm for nickel, copper, zinc, lead, selenium, arsenic and mercury; Mo filter of 1.25 mm for antimony. The mixed solution of chromium, iron, manganese, nickel, copper, zinc, lead, selenium, arsenic, mercury and antimony was prepared with the national standard solutions. The measurement of heavy metals in solution with instrument was discussed. The linear correlation coefficients of calibration curves for all elements were all above 0.99, and the limit of detection was between 0.04 and 0.39 μg/mL. The mixed solution of 1 μg/mL was determined for several times. The relative standard deviation (RSD) for chromium was maximum, i.e., 19.5%, while RSDs for manganese, copper, lead, mercury and antimony were in range of 10%-15%, and RSDs for other elements were all less than 10%. Various heavy metal ions in water solution could be rapidly detected by EDXRF, which provided a reference for the detection of heavy metals in water solution.