1、Designation:D501201(Reapproved 2013)Standard Guide forPreparation of Materials Used for the Collection andPreservation of Atmospheric Wet Deposition1This standard is issued under the fixed designation D5012;the number immediately following the designation indicates the year oforiginal adoption or,in
2、 the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This guide presents recommendations for the cleaningof plastic or glass materials used fo
3、r collection of atmosphericwet deposition(AWD).This guide also presents recommenda-tions for the preservation of samples collected for chemicalanalysis.1.2 The materials used to collectAWD for the analysis of itsinorganic constituents and trace elements should be plastic.High density polyethylene(HD
4、PE)is most widely used and isacceptable for most samples including samples for the deter-mination of the anions of acetic,citric,and formic acids.Borosilicate glass is a collection alternative for the determina-tion of the anions from acetic,citric,and formic acid;it isrecommended for samples for th
5、e determination of otherorganic compounds.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the u
6、ser of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D883 Terminology Relating to PlasticsD1125 Test Methods for Electrical Conductivity and Resis-tivity of WaterD1
7、129 Terminology Relating to WaterD1193 Specification for Reagent WaterD1356 Terminology Relating to Sampling and Analysis ofAtmospheresD1695 Terminology of Cellulose and Cellulose DerivativesD2914 Test Methods for Sulfur Dioxide Content of theAtmosphere(West-Gaeke Method)D4453 Practice for Handling
8、of High Purity Water Samples3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this guide,refer toTerminology D1129.3.1.2 For definition of plastic refer to Terminology D1695and Terminology D883.3.1.3 For definition of AWD(precipitation,meteorologi-cal)refer to Terminology D1356.4.S
9、ignificance and Use4.1 Some chemical constituents of AWD are not stable andmust be preserved before chemical analysis.Without samplepreservation,it is possible that analytes can be lost throughdecomposition or sorption to the storage bottles.4.2 Contamination of AWD samples can occur during bothsamp
10、le preservation and sample storage.Proper selection andcleaning of sampling containers are required to reduce thepossibility of contamination of AWD samples.4.3 The natural sponge and talc-free plastic gloves used inthe following procedures should be recognized as potentialsources of contamination.I
11、ndividual experience should beused to select products that minimize contamination.5.Apparatus5.1 Instruments shall be selected in accordance with anapplicable test method given in Test Methods D1125.5.2 The conductivity cell shall be pipet or dip type with acell constant(K)of 0.1.6.Reagents and Mate
12、rials6.1 Purity of ReagentsReagent grade acids and otherchemicals shall be used to reduce the risk of contaminating theAWD samples.Unless otherwise indicated,it is intended thatall reagents conform to the specifications of the Committee on1This guide is under the jurisdiction of ASTM Committee D22 o
13、n Air Qualityand is the direct responsibility of Subcommittee D22.03 on Ambient Atmospheresand Source Emissions.Current edition approved Oct.1,2013.Published October 2013.Originallyapproved in 1989.Last previous edition approved in 2008 as D5012-01(2008).DOI:10.1520/D5012-01R13.2For referenced ASTM
14、standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 194
15、28-2959.United States1 Analytical Reagents of the American Chemical Society wheresuch specifications are available.36.2 Nitric acid,ultra pure.6.3 Nitric acid(1+9)Dilute 1 volume concentrated nitricacid with 9 volumes of water.6.4 Chloroform,high performance liquid chromatographyreagent.6.5 Hydrochl
16、oric acid,pretested for total and methyl mer-cury.6.6 Purity of WaterUnless otherwise indicated,referencesto water shall be understood to mean reagent water as definedby Type I of Specification D1193.AWD samples collected fororganic analysis may require Type II(distilled)reagent water.7.Sample Preservation7.1 Interaction between the sample and the atmosphere mustbe minimized.The sample container should be sealed as soonas possible after collection or sub-sampling.AWD samples canbe easily contami
