低浓度尿素检测方法探究
摘要
尿素在水环境氮循环中起重要作用,但不易检测。文章讨论了在不同条件下研究尿素与二乙酰单肟的比色反应,反应温度和时间、不同浓度的试剂条件下尿素浓度测定的影响,并确定最佳反应条件。结果表明,尿素混合物在85℃的水浴上加热30min,加热完以后浸入自来水中冲洗冷却10min,冷却后稳定放置1h,用1cm比色皿在520nm波长在分光光度计下测量吸光度是最为稳定的。
引文
[1] Solomon C M, Collier J L, Berg G M, et al. Role of urea in microbial metabolism in aquatic systems:a biochemical and molecular review[J]. Aquatic Microbial Ecology, 2010, 59(1):67-88.
[2] Laura A S, Waller A S, Mende D R, et al. Role for urea in nitrification by polar marine Archaea[J]. Proc Natl Acad Sci U S A, 2012, 109(44):17989-17994.
[3] Francis P S, Lewis S W, Lim K F. Analytical methodology for the determination of urea:current practice and future trends[J].TrendsinAnalyticalChemistry,2002,21(5):389-400.
[4] Lambert D F, Sherwood J E, Francis P S. The determination of urea in soil extracts and related samples—a review[J]. Soil Research, 2004, 42(7):709-717.
[5] Beale R N, Croft D. A sensitive method for the colorimetric determination of urea[J]. Journal of Clinical Pathology, 1961,14(4):418-424.
[6] Mulvennaa P F, Savidgea G. A modified manual method for the determination of urea in seawater using diacetylmonoxime reagent[J]. Estuarine Coastal&Shelf Science, 1992, 34(5):429-438.
[7] Persson C, Nordstr?m K. A Room Temperature Procedure for the Manual Determination of Urea in Seawater[J]. Estu arine Coastal&Shelf Science, 1998, 47(4):415-418.
[8] Revilla M, Alexander J, Glibert P M. Urea analysis in coastal waters:comparison of enzymatic and direct methods[J].Limnology&Oceanography Methods, 2005, 3(7):290-299.
[2] Laura A S, Waller A S, Mende D R, et al. Role for urea in nitrification by polar marine Archaea[J]. Proc Natl Acad Sci U S A, 2012, 109(44):17989-17994.
[3] Francis P S, Lewis S W, Lim K F. Analytical methodology for the determination of urea:current practice and future trends[J].TrendsinAnalyticalChemistry,2002,21(5):389-400.
[4] Lambert D F, Sherwood J E, Francis P S. The determination of urea in soil extracts and related samples—a review[J]. Soil Research, 2004, 42(7):709-717.
[5] Beale R N, Croft D. A sensitive method for the colorimetric determination of urea[J]. Journal of Clinical Pathology, 1961,14(4):418-424.
[6] Mulvennaa P F, Savidgea G. A modified manual method for the determination of urea in seawater using diacetylmonoxime reagent[J]. Estuarine Coastal&Shelf Science, 1992, 34(5):429-438.
[7] Persson C, Nordstr?m K. A Room Temperature Procedure for the Manual Determination of Urea in Seawater[J]. Estu arine Coastal&Shelf Science, 1998, 47(4):415-418.
[8] Revilla M, Alexander J, Glibert P M. Urea analysis in coastal waters:comparison of enzymatic and direct methods[J].Limnology&Oceanography Methods, 2005, 3(7):290-299.