NF G06-006-2-2010 纺织品.定量化学分析.第2部分:三组分纤维混合物.

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【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】:


Product Code:SAE AS3613
Title:Bolt, Machine - Double Hexagon Extended Washer Head, Close Tolerance Shank, Cobalt-Nickel Alloy, Uns R30159, 260 Ksi Min
Issuing Committee:E-25 General Standards For Aerospace And Propulsion Systems
Scope:No scope available.