海水化学需氧量的快速测定_王金丽_孙永利_尚巍_穆莹_周蕾_高晨晨
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2020-01-13 08:45:18
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书书书海水化学需氧量的快速测定王金丽,孙永利,尚巍,穆莹,周蕾,高晨晨(中国市政工程华北设计研究总院,天津300074)摘要:建立了一种快速测定海水化学需氧量的方法:利用硝酸银部分沉淀去除海水水样中浓度约为20000mg/L的氯离子,硝酸银最优投量为3.5gAgNO3/gCl-,沉淀离心后取上清液2mL,加入0.2g硫酸汞掩蔽剩余氯离子,采用HACHCOD快速消解试剂消解15min,最后用分光光度法测定海水化学需氧量。整个过程操作简便、快速,仅需0.5h,方法的准确性和重现性较好,可用于测定COD为15~150mg/L海水的化学需氧量。关键词:海水化学需氧量;硝酸银;氯离子;COD快速消解中图分类号:X834文献标识码:C文章编号:1000-4602(2014)02-0095-03RapidDeterminationofChemicalOxygenDemandinSeawaterWANGJin-li,SUNYong-li,SHANGWei,MUYing,ZHOULei,GAOChen-chen(NorthChinaMunicipalEngineeringDesignandResearchInstitute,Tianjin300074,China)Abstract:Amethodforrapiddeterminationofchemicaloxygendemandinseawaterwasestab-lished.Topartlyremove20000mg/Lchlorideioninseawaterbyprecipitationmethodusingsilverni-trate,theoptimaldosageofsilvernitratewas3.5gAgNO3/gCl-.Aftercentrifugation,0.2gmercurysulfatewasaddedinto2mLsupernatanttomasktheinterferenceofresidualchlorideion.Thesamplewasdigestedfor15minbyHACHdigestionreagentforCOD,andthechemicaloxygendemandinseawaterwasdeterminedbyspectrophotometry.Thewholeprocessw
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