Properties:
| RelatedCategories | AdditionalStandards,AnalyticalStandards,Analytical/Chromatography,ProficiencyTesting,WaterSupply/DrinkingWaterInorganics, |
| packaging | ampuleof1×20 mL |
| mfr.no. | RTC,PEI-233 |
| concentration | inH2O |
Description:
Generaldescription
ThisproficiencytestingsampleisproducedinaccordancewithISO/IEC17043:2010.Allinformationregardingtheuseofthismaterialcanbefoundinthereportingpacketsuppliedforeachsample.
OtherNotes
Proficiencytestingsamplesarepresentedassingleblind.Novaluesforthesamplesarereleaseduntilthetestingperiodconcludes.Valuesofanalytesvarylottolot.
ProficiencyTestingSchedule(2017-2018)
DrinkingWater
WS17-1January18-March3,2017
WS17-2March29-May12,2017
WS17-3July12-August25,2017
WS17-4September27-November10,2017
WS18-1January17-March2,2018
WS18-2March28-May11,2018
WS18-3July11-August24,2018
WS18-4September26-November9,2018
Quick-TurnStudy-(non-scheduledproficiencytestthatisavailableatanytime)
PreparationNote
ThisPTsampleispackagedasa20mLconcentrate.
Thesolventforthissampleiswater.
ThePTsamplehasbeenautoclavedforpreservation.
Thesamplemustbestoredat4degreesCelsius.
Analyteconcentrationrange(mg/L):
5-dayBOD-5to50
CarbonaceousBOD-5to50
COD-5to50
TOC-1to50
Samplepreparation
Topreparesolution,partiallyfilla1-Lvolumetricflaskwithreagent-gradewater.
OpenampulePE1388(becarefultoavoidcutsonglass)andtransfer10mLfromtheampuleintotheflask.
Fillthevolumetricflasktovolumewithreagent-gradewaterandmixwell.
Thesampleisnowreadyforimmediateanalysis.
AnalyzethesolutiontodetermineBODorCBODfirst.IfCODandTOCcannotbedeterminedwithintwohoursaftersamplepreparation,analiquotshouldbepreserved(pH<2)using0.2mLofconcentratedsulfuricacidper100mL.Thisaliquotshouldbestoredat4degreesCelsiusandanalyzedassoonaspossIBLewithinthe28-daymaximumholdingtime.
NOTES:ForproperoxygendepletionofBODandCBOD,thesampleshouldbetestedinadilutionseries.Useanaturalsurfacewaterordiluteddomesticsewageforseededdilutionwaterandavoidentrainmentofair.ForanalysisofCBOD,theuseofanitrifyinginhibitorisrecommended.Besuretodeterminethe“blank”BODofyourseededdilutionwatersothattheproperseedcorrectioncanbemade
