Determination of available phosphorus content in compound fertilizers by gravimetric method and ICP-OES method and uncertainties comparison
The available phosphorus content in compound fertilizers are determined by gravimetric method and ICP-OES method,and the measurement uncertainties are evaluated and compared.The determination result of available phosphorus by gravimetric method is(20.71±0.07)％,with an expanded uncertainty of 0.07％(k=2),which mainly comes from the measurement repeatability of the sample;The determination result of available phosphorus by ICP-OES method is(20.74±0.64)％,with an extended uncertainty of 0.67％(k=2),which mainly comes from the dilution of the series of standard solutions.Compared to the ICP-OES method,the gravimetric method has higher accuracy and the results are stable,making it suitable for measurements with high accuracy requirements;The ICP-OES method is suitable for large-scale measurements.
万方数据
维普
