引用本文:李晓惠,刘海军,田亚赛,许艳广.滤膜过滤-微波干燥法快速测定水中悬浮物[J].环境监控与预警,2023,15(2):52-55
LI Xiao-hui, LIU Hai-jun, TIAN Ya-sai, XU Yan-guang.Rapid Determination of the Suspended Substance in Water by Membrane Filtration Microwave Drying[J].Environmental Monitoring and Forewarning,2023,15(2):52-55
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滤膜过滤-微波干燥法快速测定水中悬浮物
李晓惠,刘海军,田亚赛,许艳广
辽宁科技学院,生物医药与化学工程学院,辽宁 本溪 117004
摘要:
采用滤膜过滤-微波干燥技术,建立了水中悬浮物的快速测定方法。以0.45μm 硝酸-乙酸纤维素(CN-CA)滤膜为过滤介质,采用变功率连续加热模式,空白湿滤膜在10 min内恒重(900 W/5 min +500 W/5 min),附有悬浮物的湿滤膜在13 min内恒重(900 W/8 min + 500 W/5 min)。选择不同质量浓度的高岭土标准样品和不同类别的实际样品进行方法性能测试,结果表明,该方法检出限为 5 mg/L,相对标准偏差(RSD)为2.7%~7.1%,相对误差为2.0%~5.0%,采用该方法与采用标准方法《水质 悬浮物的测定 重量法》(GB 11901—89)测定实际样品的结果吻合。该方法显著缩短了水中悬浮物测定的分析时间,精密度和准确度能够满足分析要求,可用于地表水及一般工业排放废水中悬浮物质量浓度的快速测定。
关键词:  悬浮物  快速测定  微波干燥  硝酸-乙酸纤维素滤膜
DOI:
分类号:X832; S959
基金项目:辽宁省教育厅服务地方项目(L2020lkyfwdf-06);辽宁省教育厅面上项目(LJKZ1064)
Rapid Determination of the Suspended Substance in Water by Membrane Filtration Microwave Drying
LI Xiao-hui, LIU Hai-jun, TIAN Ya-sai, XU Yan-guang
Department of Biomedical and Chemical Engineering,Liaoning Institute of Science and Technology,Benxi,Liaoning 117004, China
Abstract:
A rapid determination method of the suspended substance in water was established by membrane filtration microwave drying. By using 0.45 μm cellulose nitrate cellulose acetate(CN-CA) filter membrane as filtering medium and adopting variable power continuous heating mode, the blank wet filter membrane reached at constant weight in 10 min (900 W/5 min +500 W/5 min mode), the wet filter membrane with suspended substance reached at constant weight in 13 min (900 W/8 min +500 W/5 min mode). Performance testing of the method was performed by determining different concentrations of standard kaolin samples and different sorts of real samples, by statistics, giving detection limit of 5 mg/L, relative standard deviation of 2.7%~7.1% and relative error of 2.0%~5.0%, the determination results of this method for real samples was consistent with that of standard method (GB 11901—89). This method dramatically reduced the analysis time for the determination of suspended substance in water, the precision and accuracy meet the analysis requirements, it can be used for rapid determination of suspended substance in surface water and general industrial waste water.
Key words:  Suspended substance  Rapid determination  Microwave drying  CN CA filter membrane