ASTM_D_5086_-_01_2013.pdf

Designation:D508601(Reapproved 2013)Standard Test Method forDetermination of Calcium,Magnesium,Potassium,andSodium in Atmospheric Wet Deposition by Flame AtomicAbsorption Spectrophotometry1This standard is issued under the fixed designation D5086;the number immediately following the designation indicates the year oforiginal adoption or,in 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 test method is applicable to the determination ofcalcium,magnesium,potassium,and sodium in atmosphericwet deposition(rain,snow,sleet,and hail)by flame atomicabsorption spectrophotometry(FAAS).(1)21.2 The concentration ranges are listed below.The rangetested was confirmed using the interlaboratory collaborativetest(see Table 1 for a statistical summary of the collaborativetest).MDL(mg/L)(2)Range of Method(mg/L)Range Tested(mg/L)Calcium0.0090.033.000.1682.939Magnesium0.0030.011.000.0390.682Potassium0.0030.011.000.0290.499Sodium0.0030.012.000.1051.841.3 The method detection limit(MDL)is based on singleoperator precision(2)and may be higher or lower for otheroperators and laboratories.Many workers have found that thistest method is reliable at lower levels than were tested,but theprecision and bias data presented are insufficient to justify theiruse at lower levels.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.Specific warningstatements are given in 8.3,8.7,12.1.8,and Section 9.2.Referenced Documents2.1 ASTM Standards:3D883 Terminology Relating to PlasticsD1129 Terminology Relating to WaterD1193 Specification for Reagent WaterD1356 Terminology Relating to Sampling and Analysis ofAtmospheresD2777 Practice for Determination of Precision and Bias ofApplicable Test Methods of Committee D19 on WaterD4453 Practice for Handling of High Purity Water SamplesD4691 Practice for Measuring Elements in Water by FlameAtomic Absorption SpectrophotometryD5012 Guide for Preparation of Materials Used for theCollection and Preservation of Atmospheric Wet Deposi-tionE131 Terminology Relating to Molecular SpectroscopyE275 Practice for Describing and Measuring Performance ofUltraviolet and Visible SpectrophotometersE694 Specification for Laboratory Glass Volumetric Appa-ratusIEEE/ASTM SI-10 Standard for Use of the InternationalSystem of Units(SI):The Modern Metric System3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this test method,referto Terminologies D883,D1129,D1356,E131,and PracticesD4691,E275,and IEEE/ASTM SI-10.3.1.2 method detection limit,MDLthe minimum concen-tration of an analyte that can be reported with 99%confidencethat the value is above zero based on a standard deviation ofgreater than seven repetitive measurements of a solutioncontaining the analyte at a concentration near the low standard.The analyte concentration of this solution should not be greaterthan ten times the estimated MDL.1This test method is under the jurisdiction of ASTM Committee D22 on AirQuality and is the direct responsibility of Subcommittee D22.03 on AmbientAtmospheres and Source Emissions.Current edition approved Oct.1,2013.Published October 2013.Originallyapproved in 1990.Last previous edition approved in 2008 as D5086 01(2008).DOI:10.1520/D5086-01R13.2The boldface numbers in parentheses refer to a list of references at the end ofthis test method.3For referenced ASTM 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 19428-2959.United States1 4.Summary of Test Method4.1 Asolution containing the metal(s)of interest is aspiratedas a fine mist into an air acetylene flame where it is convertedto an atomic vapor consisting of ground state atoms.Theseground state atoms are capable of absorbing electromagneticradiation over a series of very narrow,sharply defined wave-lengths from a distinct line source of light,usually a hollowcathode lamp specific to the metal of interest,passed throughthe flame.Light from the source beam,less whatever intensitywas absorbed by the atoms of the metal of interest,is isolatedby the monochromator and measured by the photodetector.Theamount of light absorbed by the analyte is quantified bycomparing the light transmitted through the flame to lighttransmitted by a reference beam.The amount of light absorbedin the flame is proportional to the concentration of the m