ASTM_F_1647_-_11.pdf

Designation:F164711An American National StandardStandard Test Methods forOrganic Matter Content of Athletic Field Rootzone Mixes1This standard is issued under the fixed designation F1647;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 These test methods cover the determination of thepercent organic matter of a putting green root zone mixtureusing a loss on ignition method or the Walkley Black method.These test methods are useful for quantifying the organicmatter content of volume ratio mixed root zone mixes.TestMethods D2974 is recommended for peat and other organicsoils.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use,nor the disposalof hazardous waste that may be generated.It is the responsi-bility of the user of this standard to establish appropriate safetyand health practices and determine the applicability of regu-latory limitations prior to use.For a specific precautionarystatement,see 8.2.6.2.Referenced Documents2.1 ASTM Standards:2D2974 Test Methods for Moisture,Ash,and Organic Matterof Peat and Other Organic SoilsE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Summary of Test Methods3.1 Method AOrganic matter content is determined by losson ignition(LOI).3.2 Method B3Organic matter content is determined bythe Walkley-Black method;a dichromate oxidation procedurewhereby the color intensity of the reaction product is deter-mined colorimetrically.4.ApparatusMethod A4.1 Oven,capable of maintaining a constant temperature of105 6 5C.4.2 Muffle furnace,capable of producing constant tempera-tures of 360 6 10C.4.3 Evaporating dish or crucible,made of high silica orporcelain of not less than 10-mL capacity.4.4 Desiccator,4.5 Aluminum foil,heavy duty,and4.6 Balance,sensitive to 0.001 g.5.ApparatusMethod B5.1 Soil grinder,5.2 Balance,sensitive to 0.01 g.5.3 Sulfuric acid,concentrated(not less than 96%),5.4 Potassium dichromate,1 N,made by dissolving 49.04reagent-grade potassium dichromate in water,and diluting to avolume of 1 L,5.5 Spectrophotometer or colorimeter,set at or adjustable to610-nm wavelength.5.6 Standard,10 000 mg/L as CO2,5.7 Pipets,assorted,capable of measuring volumes of 0.1 to10 mL,5.8 Glassware,assorted,to include 250-mL Erlenmeyerflasks and funnels(75-mm ID),and5.9 Oven,capable of maintaining a constant temperature of105 6 5C.6.ProcedureMethod A6.1 Scoop 5 to 10 g of oven-dried(105 6 5C)soil intotared crucibles.1These test methods are under the jurisdiction of ASTM Committee F08 onSports Equipment and Facilitiesand are the direct responsibility of SubcommitteeF08.64 on Natural Playing Surfaces.Current edition approved April 1,2011.Published May 2011.Originallyapproved in 1995.Last previous edition approved in 2010 as F1647 02a(2010).DOI:10.1520/F1647-11.2For 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.3Procedure was based on procedure published in“Methods of SoilAnalysis,Part2:Chemical and Microbiological Properties,”American Society of AgronomyMonograph No.9,2nd Ed.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.2 Weigh and record weight to the nearest 0.001 g.6.3 Place the sample into a muffle furnace heated to 360 610C.Leave the sample in the furnace for 2 h.6.4 Cool to 105C,or cover with a piece of foil and cool ina desiccator.6.5 Weigh ash in a draft-free environment to the nearest0.001 g.7.Calculation of Percent Organic Matter,Method A7.1 Calculate percent organic matter as follows:LOI,%5(1)oven2 dry soil weight2 ash weight!/oven2 dry soil weight#31008.ProcedureMethod B8.1 Preparing a Standard Curve:8.1.1 Set up five 250-mL Erlenmeyer flasks.8.1.2 Use a pipet to pipet the volumes of standard solutioninto the flasks,as listed below.mL of 10 000 mg/L CO2%Organic matter000.200.90.502.21.004.41.205.38.1.3 Pipet 10 mL of potassium dichromate into each flask.8.1.4 In a well ventilated area,pipet or dispense 20 mL ofsulfuric acid into each flask.8.1.5 Cover the flask and allow the reaction to progress for10 min.8.1.6 Add 100 mL of distilled or deionized water to eachflask and swirl briskly.8.1.7 Read the absorbance for each standard at 610 nm andplot a standard curve.8.2 Procedures:8.2.1 Obtain a representative,oven-dried root zone sample.8.2.2 Grind a small quantity of sample until 100%passes a140-siev