ASTM D4972-2001(2007) 土壤pH值的标准试验方法

作者:标准资料网 时间:2024-05-16 18:02:10  浏览:8435   来源:标准资料网

【英文标准名称】:StandardTestMethodforpHofSoils
【原文标准名称】:土壤pH值的标准试验方法
【标准号】:ASTMD4972-2001(2007)
【标准状态】:现行
【国别】:
【发布日期】:2001
【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】:D18.22
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:pH值;土壤分析;试验
【英文主题词】:acidity;alkalinity;pH;reaction;soil
【摘要】:ThepHofthesoilisausefulvariableindeterminingthesolubilityofsoilmineralsandthemobilityofionsinthesoilandassessingtheviabilityofthesoil-plantenvironment.pHmeasurementsaremadeinbothwaterandacalciumchloridesolutionbecausethecalciumdisplacessomeoftheexchangeablealuminum.Thelowionicstrengthcountersthedilutioneffectontheexchangeequilibriumbysettingthesaltconcentrationofthesolutionclosertothatexpectedinthesoilsolution.ThepHvaluesobtainedinthesolutionofcalciumchlorideareslightlylowerthanthosemeasuredinwaterduetothereleaseofmorealuminumionswhichthenhydrolyses.Therefore,bothmeasurementsarerequiredtofullydefinethecharacterofthesoilrsquo;pH.ForthepurposeofthistestmethodthetestsoilmustbesievedthroughaNo.10sieve(2mmsievemeshopenings).Measurementsonsoilsorsoilfractionshavingparticlesizeslargerthan2mmbythistestmethodmaybeinvalid.Ifsoilorsoilfractionswithparticleslargerthan2mmareused,itmustbestatedinthereportsincetheresultsmaybesignificantlydifferent.AllwaterusedforthistestmethodmustbeASTMTypeIIIorbetter.TypeIIIwaterisdefinedbySpecificationD1193.Itispreparedbydistillation,ionexchange,reverseosmosis,oracombinationthereof.1.1ThistestmethodcoversthemeasurementofthepHofsoilsforusesotherthanforcorrosiontesting.Suchmeasurementsareusedintheagricultural,environmental,andnaturalresourcesfields.Thismeasurementdeterminesthedegreeofacidityoralkalinityinsoilmaterialssuspendedinwateranda0.01Mcalciumchloridesolution.Measurementsinbothliquidsarenecessarytofullydefinethesoil''spH.Thisvariableisusefulindeterminingthesolubilityofsoilmineralsandthemobilityofionsinthesoilandassessingtheviabilityofthesoil-plantenvironment.Amoredetaileddiscussionoftheusefulnessofthisparameterisnotwarrantedhere;however,itcanbefoundinmanydiscussionsofthesubject.AfewsuchdiscussionsaregivenasRefs(1-6)attheendofthetext.1.2ThevaluesgiveninSIunitsaretoberegardedasthestandard.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:B10
【国际标准分类号】:13_080_10
【页数】:3P.;A4
【正文语种】: