基于数字图像比色法测定水中氟化物

Determination of Fluoride in Water by Digital Image Colorimetry

在酸性溶液中,氟能破坏二甲酚橙锆显色体系,使溶液颜色从紫红色变为橙色或黄色,通过采集图像颜色信息构建3个特征颜色分量的多元线性回归模型,用以定量测定水中氟。该方法在0 mg/L~1.5 mg/L范围内线性良好,方法检出限为0.03 mg/L。两个质量浓度水平的氟化物标准溶液6次测定结果的RSD分别为1.4%和1.3%,相对误差分别为0.3%和1.7%。

In acidic solution,fluoride can destroy the color development system of Zr-xylenol orange and change the color of the solution from purplish red to orange or yellow.A multiple linear regression model with three characteristic color components was established by collecting color information of images to quantitatively determine fluorine in water.The method had good linearity in the range of 0 mg/L to 1.5 mg/L.The detection limit was 0.03 mg/L.The RSDs of six measurements of fluoride standard solution at two mass concentration levels were 1.4%and 1.3%,and the relative errors were 0.3%and 1.7%,respectively.