碱熔—电感耦合等离子体发射光谱法(ICP-AES)同时测定土壤中的多组分元素OA

Soil minerals are diverse and chemically complex.To accurately and efficiently analyze multi-component elements(SiO2,Al2O3,TFe2O3,Mn,P)in soil,while addressing issues such as lengthy experimental procedures,complicated operations,and high analysis costs,the author establishes a method for determining these elements using Alkali fusion-inductively coupled plasma atomic emission spectrometry(ICP-AES).The procedure involves fusing the sample with 3.0g of NaOH in a silver crucible at 700℃ for 15 minutes,followed by hot-melt leaching and acidification with hydrochloric acid.Key parameters,including flux selection,fusion temperature,and duration,were optimized to ensure complete sample decomposition.The amount of NaOH was controlled to reduce salt content in the solution,thereby enhancing measurement stability.By scanning standard and blank solutions,spectral lines with minimal interference and high sensitivity were selected to eliminate spectral interference.Validation using national standard reference materials(GBW07457,GBW07451)showed relative standard deviations(RSD,n=6)ranging from 0.11%to 1.87%,and relative errors between-0.74%and 0.89%.When applied to actual soil samples,the test results were consistent with those obtained by the lithium metaborate fusion-ICP-AES method,demonstrating that this approach is suitable for the analysis of multi-component elements(SiO2,Al2O3,TFe2O3,Mn,P)in soil.