The effect of using methanol in the flush-solvent bottle of the auto-sampler of Ion Chromatograph on the determination of sulfate ions was studied using AS11-HC 2 mm analytical column. The use of 50% methanol in the f...The effect of using methanol in the flush-solvent bottle of the auto-sampler of Ion Chromatograph on the determination of sulfate ions was studied using AS11-HC 2 mm analytical column. The use of 50% methanol in the flush solvent bottle results in overestimation of sulfate concentration by 18%. However, the use of 10% methanol instead of 50% did not show such error in the determination of sulfate using the same column. Furthermore, the effect of using OnGuard-RP and OnGuard-P cartridges for sample pretreatment on the determination of different anions was also studies using AS14-HC 2 mm analytical column. The results indicate that using OnGuard-RP cartridge caused the concentration of fluoride, bromide, nitrate, phosphate and sulfate ions to be underestimated, whereas the concentration of chloride ions to be overestimated. The error in the determination of fluoride, bromide, nitrate, phosphate sulfate, and chloride was found to be 40.0%, 26.0%, 22.8%, 26.8%, 18.0%, and 25.0% of the certified standard concentration, respectively. It was also found that the use of OnGuard-P cartridge resulted in underestimation of fluoride, chloride, bromide, nitrate, phosphate, and sulfate by 60.0%, 40.0%, 82.0%, 87.2%, 45.2%, and 39.0% of the certified standard concentration, respectively. These findings point out to careful corrections that should be considered in any application of ion chromatography utilizing such sample pretreatment.展开更多
建立一种检测饮用水中痕量溴酸盐的离子色谱方法.利用OnGuard Ⅱ Ag 柱过滤去除水中氯离子,直接进样,电导检测器检测.该方法避免了氯离子对溴酸盐的干扰,测定水质溴酸盐的灵敏度和准确度均有很大提高.溴酸盐的检出限为0.005 mg/L,测定...建立一种检测饮用水中痕量溴酸盐的离子色谱方法.利用OnGuard Ⅱ Ag 柱过滤去除水中氯离子,直接进样,电导检测器检测.该方法避免了氯离子对溴酸盐的干扰,测定水质溴酸盐的灵敏度和准确度均有很大提高.溴酸盐的检出限为0.005 mg/L,测定结果的相对标准偏差为7.56%（n=7）,加标回收率为92.0%～110.0%.该方法操作简便快速、准确度高,适合于饮用水中痕量溴酸盐的测定.展开更多
文摘The effect of using methanol in the flush-solvent bottle of the auto-sampler of Ion Chromatograph on the determination of sulfate ions was studied using AS11-HC 2 mm analytical column. The use of 50% methanol in the flush solvent bottle results in overestimation of sulfate concentration by 18%. However, the use of 10% methanol instead of 50% did not show such error in the determination of sulfate using the same column. Furthermore, the effect of using OnGuard-RP and OnGuard-P cartridges for sample pretreatment on the determination of different anions was also studies using AS14-HC 2 mm analytical column. The results indicate that using OnGuard-RP cartridge caused the concentration of fluoride, bromide, nitrate, phosphate and sulfate ions to be underestimated, whereas the concentration of chloride ions to be overestimated. The error in the determination of fluoride, bromide, nitrate, phosphate sulfate, and chloride was found to be 40.0%, 26.0%, 22.8%, 26.8%, 18.0%, and 25.0% of the certified standard concentration, respectively. It was also found that the use of OnGuard-P cartridge resulted in underestimation of fluoride, chloride, bromide, nitrate, phosphate, and sulfate by 60.0%, 40.0%, 82.0%, 87.2%, 45.2%, and 39.0% of the certified standard concentration, respectively. These findings point out to careful corrections that should be considered in any application of ion chromatography utilizing such sample pretreatment.
文摘建立一种检测饮用水中痕量溴酸盐的离子色谱方法.利用OnGuard Ⅱ Ag 柱过滤去除水中氯离子,直接进样,电导检测器检测.该方法避免了氯离子对溴酸盐的干扰,测定水质溴酸盐的灵敏度和准确度均有很大提高.溴酸盐的检出限为0.005 mg/L,测定结果的相对标准偏差为7.56%（n=7）,加标回收率为92.0%～110.0%.该方法操作简便快速、准确度高,适合于饮用水中痕量溴酸盐的测定.
