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【英文标准名称】:StandardTestMethodforAnalysisofPhytoplanktoninSurfaceWaterbytheSedgwick-RafterMethod
【原文标准名称】:用Sedgwick-木筏法分析地表水中可繁殖浮游生物的标准试验方法
【标准号】:ASTMD4148-1982(2004)
【标准状态】:现行
【国别】:
【发布日期】:1982
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:E47.01
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:浮游生物;地表水;水质;资源取回;污染控制;分析;试验
【英文主题词】:density;taxonomic;microscope;chamber
【摘要】:Phytoplanktonarebasictothefoodchaininallaquaticenvironments.Inaddition,theyhavelongbeenconsideredtobeimportantindicatorsofwater-qualityconditions.Phytoplanktondataarealsofrequentlyusedintheplanninganddesignofwater-treatmentfacilitiesandreservoirs.1.1Thistestmethodcoversdeterminingthedensityandtaxonomicclassificationofphytoplankton.Itisapplicablebothtorelativelysparseordensephytoplanktonconcentrations,providedthesuspended-sedimentconcentrationislow.TheSedgwickRafter(S-R)methodrequireslesscostlyapparatusthandoestheinvertedmicroscopemethodbutgiveslessaccurateresults.TheinherentinaccuracyintheSedgwick-Raftermethodisduetothedesignofthecountingchamberandcannotbecircumventedbyadifferentchoiceofoptics.Forthisreason,theS-Rmethodislimitedtotheuseofobjectivelenseshavingaworkingdistanceofapproximately1.6mmormore.With10ocularsthemaximumoverallmagnificationisapproximately250.Highconcentrationsofsuspendedsedimentcanobscurethealgalcells,andthuscauseinterference.1.2Thistestmethodisapplicabletobothfreshwaterandmarinesamples.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyproblems,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.ForspecificprecautionaryinformationseeSection8.
【中国标准分类号】:Z16
【国际标准分类号】:13_060_10
【页数】:3P.;A4
【正文语种】: