环境行业标准方法测定COD的PLS改进

Improvement on COD Determination of Chinese Environmental Standard Based on PLS

文章采用偏最小二乘法改进校正模型,在测定COD值的高量程和低量程范围内分别建立PLS模型,预测结果与GB法测定COD值的相对误差为4.47%和4.09%,具有较好的一致性。研究解决了环境行业标准快速消解分光光度法测定水质化学需氧量中直线拟合回归不确定性的问题。

The calibration model was improved by using partial least squares （PLS）. PLS models were built for the high span and low span of COD determination respectively. The relative errors of predicted results were 4.47% and 4.09%, which were apparently in accordance with that of GB dichromate method. The uncertainly that resulted from linear fitting regression in fast digestion spectrophotometer method for detecting water quality of Chinese environmental standard was solved.