摘要
采用疏水性多孔滤膜对水样进行气液分离预处理,优化的预处理条件为:加入抗氧化剂除掉体系中带入的氧,设置加热温度为90℃,加热时间为60 min,50%(体积分数)磷酸溶液总量为20 mL(单次加酸量为2 mL)。采用亚甲基蓝分光光度法测定所得溶液中硫化物的含量。结果表明,硫化物标准曲线的线性范围为0.050~0.700 mg·L^(-1),检出限为0.003 mg·L^(-1)。方法用于测定有证标准物质,测定值在认定值的不确定度范围内,相对误差为-1.9%~-1.6%;按照标准加入法对实际样品进行回收试验,回收率为90.6%~95.0%,测定值的相对标准偏差(n=6)为2.5%~4.6%。
Hydrophobic porous filter membrane was used for gas-liquid separation pretreatment for water samples.The optimized pretreatment conditions were follows:adding antioxidants to remove the oxygen introduced into the system,setting the heating temperature at 90℃and heating time of 60 min,and 50%(volume fraction)phosphoric acid solution with a total amount of 20 mL(a single addition amount of 2 mL of acid).Sulfide in the obtained solution was determined by methylene blue spectrophotometry.As shown by the results,the linear range of the sulfide standard curve was 0.050-0.700 mg·L^(-1),with detection limit of 0.003 mg·L^(-1).This method was used for determination of certified reference materials,and the determined values were within the uncertainty range of the certified values,with relative error ranged from-1.9%to-1.6%.Test for recovery was made on the actual samples by the standard addition method,giving results in the range of 90.6%-95.0%,with RSDs(n=6)of the determined values in the range of 2.5%-4.6%.
作者
杜江
蔡金玲
龙雯琪
DU Jiang;CAI Jinling;LONG Wenqi(CNGR Advanced Material Co.,Ltd.,Changsha 410116,China;Hunan Research Academy of Environmental Sciences,Changsha 410014,China;Hunan Environmental Monitoring Center,Changsha 410027,China)
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2023年第6期662-666,共5页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
基金
长沙市科技计划项目(kh1703142)。
关键词
硫化物
疏水性多孔滤膜
气液分离
亚甲基蓝分光光度法
sulfide
hydrophobic porous filter membrane
gas-liquid separation
methylene blue spectrophotometry
作者简介
杜江,主要研究方向为疏水性膜分离技术开发与应用,361531585@qq.com。
