The Application of the Mini-TFF System for in Situ Isolating Colloidal Organic Carbon

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• 作者：Huang wendangZheng xiangminTao jiahuiZhang guoyu
• 会议时间：2009-11-01
• 关键词：Mini-TFF system ; Colloidal organic carbon ; Isolate ; Situ
• 作者单位：Huang wendang,Zheng xiangmin,Tao jiahui(Key Laboratory of Geo-information Science of Ministry of Education, East China Normal University, Shanghai, China, 200062)Zhang guoyu(Key Laboratory of Geo-information Science of Ministry of Education, East China)
• 母体文献：第十三届世界湖泊大会论文集
• 会议名称：第十三届世界湖泊大会
• 会议地点：武汉
• 主办单位：中国环境科学学会
• 语种：chi

摘要

Water samples were collected in Changjiang estuary and then the colloidal organic carbon was isolated by mini tangential flow ultrafiltration(TFF) in situ.In the ultrafiltration process,the TFF system was washed and rinsed after every use,only with 200ml 0.1 mol/l NaOH,and 200ml Milli-Q Water,and Milli-Q water was used to be the blank test.In the blank test of the 500 KD ( 1 KD =1000 Daltons) and 5 KD ultrafiltration membrane,the concentration of dissolved organic carbon (DOC) in the permeate are 1.19mg/l and 1.14mg/l,the concentration of DOC in the retentate and ultrafiltrate are 1.19mg/l,1.14mg/l and 1.14mg/l,1.05 mg/l;Mass balance of DOC showed a good present recovery ( 102.22 9.64) % and ( 97.36 10.27 ) %,respectively.In Changjiang estuary,surface water DOC concentrations ranged from 2.58mg/l to 3.23mg/l.The percentage of surface water colloidal organic carbon(COC) ranged from 0.52% to 23.19%.In addition,COCs-500KD is 0.02-0.71mg/l,which is 60.75%-100.00% of the total COC.The results indicate that the use of the mini TFF for size fractionation of natural dissolved organic matter in situ is reliable and efficient.