森林土壤中有效磷比色方法的改进

【目的】行业标准中森林土壤中有效磷比色使用2,4-二硝基酚作为指示剂调节溶液酸度。其变色范围从深黄到浅黄,颜色变化不明显。【方法】本文通过改进指示剂,使用溴酚蓝,指示颜色变化明显,pH范围易控制。【结果】通过实验与对行业标准方法比对,无明显差异。【结论】方法精密度和准确度满足实验分析要求。

Forest soil efficientive phosphorus reductive spectrophotometeric improvement

Reductive spectrophotometer of forest soil efficientive phosphorus use 2,4-2 nitro phenol as a regulation,the acidity indicator color range from dark yellow to pale yellow color,does not change significantly.This article through the improvement,the use of bromophenol blue indicator,color change instructions is obvious.pH range easy to control.And through experiment and the industry standard method for matching,no obvious difference,the accuracy and precision of the method to meet requirements.