A comparative study of inductively coupled plasma emission spectrometry and turbi-dimetry for the determination of available sulfur in soil
The research uses inductively coupled plasma emission spectrometry(ICP-OES)and turbidimetry as com-paring methods for the determination of available sulfur in soil.The results show that the linear relationship and detec-tion limits of the two methods can meet the requirements of the standard NY/T 1121.14-2023,and the detection limits of ICP-OES method are lower than those of turbidimetric method.The relative standard deviations(RSD)of ICP-OES method and turbidimetry method were in the range of1.61～3.25%and 2.13～5.46%,respectively,and the preci-sion of ICP-OES method was better.The measurement results of soil reference materials were within the controllable range of certificate values.Through the comparison test of actual soil samples,the cost of turbidimetric method is low,but the pretreatment is complex,the stability is poor,and it takes a long time,which is suitable for the analysis of a small amount of low concentration soil samples.On the contrary,ICP-OES method is relatively costly,but it is sim-ple and fast,and has a wide range of determination,which is suitable for batch soil sample testing.
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