顺序注射光度法测定水样中硝酸盐和亚硝酸盐  

Determination of nitrate and nitrite in water by sequential injection photometric method

作　　者：何礼[1,2] 魏福祥[1,2] 许嫔[1,2] 张尚正[1,2] 

机构地区：[1]河北科技大学环境科学与工程学院,河北石家庄050018 [2]河北省污染防治生物技术实验室,河北石家庄050018

出　　处：《河北科技大学学报》2014年第2期202-207,共6页Journal of Hebei University of Science and Technology

基　　金：国家863计划(2007AA09210109)

摘　　要：通过FIAlab-3500顺序注射仪与镉柱相连，采用格里斯试剂比色法测定样品中硝酸盐和亚硝酸盐。对显色剂的浓度、样品及显色剂的注入量、流速和停留时间等参数进行了优化。结果表明，硝酸盐和亚硝酸盐含氮质量浓度在0～10mg／L范围内呈良好线性关系，线性方程分别为Y=0．2317x=0．0196（R2=0．9991）；Y=0．2500x=0．0325（R2=0．9992）。硝酸盐和亚硝酸盐的检出限分别为0．0036mg／L和0．0033mg／L，相对标准偏差分别为1．9％和1．3％，加标回收率为96％～105％。The FIAlab-3500 sequential injection connected with cadmium colum is used to determine nitrate and nitrite in the sample with the method of griess reagent colorimetric. The concentration of chromogenic reagent, the injection rate of sample and chromogenic reagent, flow rate and reaction time are optimized. The results show that the calibration curve is linear over the range0-10 mg/L of nitrate and nitrite, and the linear equation is y0. 231 7x--O. 019 6（R2：0. 999 1）and y： 0. 250 0x=0. 032 5（R2 =0. 999 2）respectively. The detection limits are 0. 003 6 and 0. 003 3 mg/L, the relative standard devi-ation values are 1.9 % and 1.3 % for nitrate and nitrite, respectively, and the recovery of standard addition is 96 % - 105 %.

关 键 词：顺序注射 硝酸盐 亚硝酸盐 镉柱还原 分光光度法 

分 类 号：X830.2[环境科学与工程—环境工程]