摘要
水样中羧酸盐类聚合物含有的羧酸根离子与异染料尼罗蓝A溶液反应,造成尼罗蓝A在特定波长处吸光度下降,吸光度下降值与聚羧酸根离子浓度呈线性关系。据此原理,采用吸光度法测定循环冷却水中聚羧酸盐的浓度,讨论波长、尼罗蓝A用量、稳定时间等对吸光度的影响;同时,研究水中共存物质Ca^2+、Mg^2+、HEDP、HS01和BTA等对PAAS测定的干扰情况。确定最佳测试条件:缓冲溶液调节待测水样pH值至6.8,向待测样中加入适量EDTA溶液消除Ca^2+、Mg^2+干扰(EDTA:Ca^2+、Mg^2+物质的量之比略大于1∶1),取5.6×10^-5mol/L的尼罗蓝A溶液10 mL,在634 nm下稳定15 min,测定吸光度。
Carboxylate ion contained in carboxylate polymer in water sample reacts with heterodye Nile Blue A solution.This causes the absorption of Nile Blue A to decrease at a specific wavelength.Decrease in absorbance has a linear relationship with polycarboxylate ion concentration.According to this principle,the concentration of polycarboxylate in circulating cooling water was measured by absorbance method.At the same time,the influence of wavelength,Nile Blue A dosage and stabilization time on absorbance was discussed.The interference of coexisting substances Ca^2+,Mg^2+,HEDP,HS01 and BTA on the determination of PAAS was also studied.Best test conditions were determined as follows.pH value of water sample was adjusted to 6.8 with buffer solution,an appropriate amount of EDTA solution was added to the sample to eliminate the interference of Ca^2+,Mg^2+(EDTA:the ratio of the amount of Ca^2+、Mg^2+was slightly greater than 1∶1),and 10 mL of 5.6×10^-5mol/L Nile Blue A solution was stabilized at 634 nm for 15 min to measure absorbance.
作者
孙亚玲
陈康
焦莉莉
SUN Yaling;CHEN Kang;JIAO Lili(School of Resource and Environment engineering,East China University of Science and Technology,Shanghai 200237,China;Shanghai Duojia Water Treatment Science and Technology Co.,Ltd.,Shanghai 200237,China)
出处
《净水技术》
CAS
2020年第8期18-22,共5页
Water Purification Technology
关键词
循环冷却水
聚羧酸盐
尼罗蓝A
分光光度法
circulating cooling water
polycarboxylate
Nile Blue A
spectrophotometry
