1、Designation:D676402(Reapproved 2013)Standard Guide forCollection of Water Temperature,Dissolved-OxygenConcentrations,Specific Electrical Conductance,and pHData from Open Channels1This standard is issued under the fixed designation D6764;the number immediately following the designation indicates the
2、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 guide describes procedures to collect cross-sectional
3、means of temperature,dissolved oxygen,specificelectrical conductance,and pH of water flowing in openchannels.1.2 This guide provides guidelines for preparation andcalibration of the equipment to collect cross-sectional means oftemperature,dissolved oxygen,specific electrical conductance,and pH of wa
4、ter flowing in open channels.1.3 This guide describes what equipment should be used tocollect cross-sectional means of temperature,dissolvedoxygen,specific electrical conductance,and pH of waterflowing in open channels.1.4 This guide covers the cross-sectional means oftemperature,dissolved oxygen,sp
5、ecific electrical conductance,and pH of fresh water flowing in open channels.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
6、 the applica-bility of regulatory requirements prior to use.2.Referenced Documents2.1 ASTM Standards:2D888 Test Methods for Dissolved Oxygen in WaterD1125 Test Methods for Electrical Conductivity and Resis-tivity of WaterD1129 Terminology Relating to WaterD1293 Test Methods for pH of WaterD4410 Term
7、inology for Fluvial SedimentD4411 Guide for Sampling Fluvial Sediment in MotionD5464 Test Method for pH Measurement of Water of LowConductivity3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this guide,refer toTerminology D1129 and D4410.3.2 Definitions of Terms Specific to This
8、Standard:3.2.1 electronic temperature sensoran electrical devicethat converts changes in resistance to a readout calibrated intemperature units.Thermistors and resistance temperaturedetectors are examples of electronic temperature sensors.3.2.2 thermometeranydeviceusedtomeasuretemperature,consisting
9、 of a temperature sensor and some typeof calibrated scale or readout device.4.Summary of Guide4.1 This guide establishes criteria and describes proceduresfor the collection of cross-sectional means of temperature,dissolved oxygen(DO),specific electrical conductance(SC),and pH of water flowing in ope
10、n channels.4.2 This guide provides only generic guidelines for equip-ment use and maintenance.Field personnel must be familiarwith the instructions provided by equipment manufacturers.There are a large variety of available field instruments and fieldinstruments are being continuously updated or repl
11、aced usingnewer technology.Field personnel are encouraged to contactequipment manufacturers for answers to technical questions.5.Significance and Use5.1 This guide describes stabilization criteria for recordingfield measurements of Temperature,DO,SC,and pH.5.2 This guide describes the procedures use
12、d to calibrateand check meters to be used in the field to records thesemeasurements and the procedures to be use in the field toobtain these data.5.3 This guide describes quality assurance procedures to befollowed when obtaining cross-sectional means of temperature,1This guide is under the jurisdict
13、ion of ASTM Committee D19 on Water and isthe direct responsibility of Subcommittee D19.07 on Sediments,Geomorphology,and Open-Channel Flow.Current edition approved Jan.1,2013.Published January 2013.Originallyapproved in 2002.Last previous edition approved in 2007 as D6764 02(2007).DOI:10.1520/D6764-
14、02R13.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C7
15、00,West Conshohocken,PA 19428-2959.United States1 dissolved oxygen,specific electrical conductance,and pH ofwater flowing in open channels.5.4 Field measurement must accurately represent the waterflowing in the open channel being measured.Methods need tobe used that will result in an accurate repres
16、entation of themean of the parameter of interest.Procedures must be used thatwill take into consideration the variation in the parameteracross the sections and with depth.5.5 Temperature and DO must be measured directly in thewater in the open channel.SC and pH are often measured insitu,but also may be measured in a subsample of a compositesample collected using discharge-weighted methods.6.ProcedureGeneral Comments6.1 Field measurements should represent,as closely aspossible,the natural conditi
