流动注射-分光光度法在线全自动测定正磷酸盐.pdf

第22卷第1期
化学研究
中国科技核心期刊
2011年1月
CHEMICAL RESEARCH
hxy@henu.edu.cn
流动注射-分光光度法在线全自动测定正磷酸盐
郑立静',洪陵成,杨威',王林芹2
(1.河海大学环境科学与工程学院,江苏南京210098;2.南京德林环保仪器有限公司,江苏南京21113
摘要:通过将GB/T6913-2008分光光度法在线化,设计研制了正磷酸盐流动注射自动在线监测仪;优化了显
色剂浓度、载流液浓度、采样环长度等实验参数,建立了水中正磷酸盐流动注射全自动在线分析方法,并考察了
其实际使用效果.结果表明,当待测水样中PO~浓度在0~15.0mg/L范围内时,吸光度和浓度呈良好的线性
关系,检出限为1.0g/L;将其用于测定湖泊水和工业废水,回收率分别为99.4%和106.2%,所研制的正磷酸
盐流动注射自动在线监测仪具有消耗试剂量少、测定快速、灵敏、抗干扰能力强等特点,可满意地用于测定地表
水和工业废水等
关词:流动注射;分光光度法;废水;正磷酸盐;在线测定
中图分类号:O652.2
文献标志码:A
文章编号:1008-1011(2011)01-0066-03
On-line automatic determination of orthophosphate in
wastewater by flow injection spectrophotometry
ZHENG Li-jing, HONG Ling cheng, YANG Wei, WANG Lin-qins
(1. Institute of Enironmental Science and Engineering, Hehai University, Nanjing 210098, Jiangsu, China
2. Delin Environmental Istrument Co Ltd, Nanjing 211103, iangsu, China
Abstract: An on-line automatic monitoring unit for determination of orthophosphate in
wastewater was designed and developed in relation to GB/T6913-2008, based on flow injection
analysis and spectrophotometry. The flow injection spectrophotometric method for on-line au-
tomatic determination of orthophosphate was established based on optimization of testing pa
rameters including concentration of chromogenic agent, concentration of carrier solution, and
length of sampling circle. The applicability of the device to determining orthophosphate in
practical wastewater samples was investigated. It was found that within a concentration range
of 0-15. 0 mg/L, PO; " aqueous samples could be well detected on-line with good linear rela
tionship between absorbancy and concentration and to a detection limit of 1.0 pg/L. When it
was used to determine orthophosphate in rivers and wastewaters, a recovery of 99.4% and
106.2% was reached. In one word, the method is of low reagent consumption, rapid determi-
nation rate, high sensitivity, and strong endurance to interferences, and it can be satisfactorily
used to determine orthophosphate in surface water and industrial wastewater
Keywords: flow injection; spectrophotometry; wastewater; orthophosphate; on-line analysis
传统的钼锑抗分光光度法测定正磷酸盐,手工操作繁琐、重现性差,分析时间较长,不适用于样品的批
量连续分析.流动注射分析(FIA)2具有分析速度快、精密度高等特点,在环境水质自动监测中得到了广泛
应用~-?.为适应环境分析的需要,作者采用流动注射分析技术,建立了一种正磷酸盐的快速分析方法,并
收稿日期:2010-09-14
作者简介;郑立静(1984~),女,硕土生.研究方向:水环境全自动在线监测.E-mail:2aishuiyifang2006@163.com