【摘要】 目的为解决标准物质中铝测定值无法达到证书认定值的问题,对前处理方法进行研究。方法分别采用硝酸体系湿法消解、氟化氢微波消解和不同温度的干灰化法,等离子体发射光谱法测定标准物质中的铝。结果前处理方法直接影响标准物质中铝的检测结果,采用常规的硝酸体系湿法消解及500~550℃的干灰化进行前处理,均无法达到标准物质的证书认定值,需要采取氢氟酸体系(硝酸-氢氟酸-过氧化氢=8:1:1,V/V/V)微波消解或者提高灰化温度(800~950℃)才能满足检测要求。结论对标准物质中铝的检测建议采用氢氟酸体系消解或高温灰化法,以满足检测准确性的要求。更多还原

【Abstract】 Objective The pretreatment method was studied to solve the disagreement of aluminum in the reference substances between detection and the value of the certificate.Methods The pretreatment method of wet digestion with nitric acid,microwave digestion of hydrogen fluoride and dry ashing at different temperatures were used to determine aluminum in the reference substances by plasma emission spectrometry.Results Pretreatment method affected the test result of aluminum in reference substances directly.The result showed that wet digestion with nitric acid and dry ashing at 500-550 ℃ could not reach the value of the certificate of reference substances,meanwhile microwave digestion of hydrogen fluoride（ HNO₃-HF-H₂O₂= 8 : 1 : 1,V/V/V） and dry ashing at more higher temperature（ 800-950 ℃） could meet the testing requirements.Conclusion The determination of aluminum in reference substances is recommended by hydrofluoric acid system digestion or higher temperature ashing method to ensure the accuracy of the test result.更多还原