分光光度法快速测定复合肥中有效磷含量的测量不确定度评定

Assessment of Uncertainty in Rapid Determination of Available Phosphate Content in Compound Fertilizers by Spectrophotography

分析了分光光度法快速测定复合肥中有效磷含量的测量不确定度的主要来源,对各不确定度分量进行了评定,求得合成标准不确定度和扩展不确定度分别为0.21%和0.42%。不确定度分析与评定结果表明:影响分光光度法快速测定复合肥中有效磷含量的测量不确定度的主要因素是标准工作曲线拟合引入的不确定度,加强这方面的控制可提高测量结果的准确性。

The main sources of uncertainty are analyzed in rapid determination of available phosphate content in compound fertilizers by spectrophotography, an assessment is made of various uncertainty components, and it is found that the composition standard uncertainty and extension uncertainty are respectively 0.21% and 0.42%. The results of uncertainty analysis and assessment show that the main factor affecting uncertainty in determination is the uncertainty introduced into the standard working cure fitting, so strengthening the control in this respect will improve the precision of the determination results.