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6.8 6 7 2 Zero the photometer wIth thIS blank before readIng the samples Procedure for low concentratIOn ( < 1000 ug/l) 6 8 1 Perform steps 6 1and 6 21fneeded 6 8 2 Place 50 ml sample In a Nessler tube 683 InrapidsucceSSIonadd10mlof1+1Hel(54) 6 8 4 Add 2 0 ml ammOnIum molybdate reagent (5 5) 685 MIxbyInvertIngatleastSIXtImes 6.8 6 Let stand 5 to 10 mInutes 6 8 7 Add 1 5 ml oxalIc aCId solutIOn (5 6) 6 8.8 MIX thoroughly 6 8.9 At least 2, but not more than 15 mInutes after oxalIc aCId addItIon, add 2 0 ml reducIng agent (5 10) 6 8 10 MIx thoroughly 6 8 11 Walt 5 mInutes, read photometncally or Visually 6 8 12 IfdIgestIOn (6 2) was used see (64) 6813 Photometncmeasurement 68 13 1 Prepare a calIbratIOn curve USIng approxImately 6 standards and a reagent blank to span the range shown below WIth the selected lIght path 6 8 13 2 6 8 13 3 6 8 13 4 68 135 Read versus distIlled water Plot photometnc readIng at 650 nm or at 815 nm versus ug of SIlIca In 565 ml. For turbIdIty correctIOn use 6 1, 62 If used and 6 8 2-6 8 11 omIttIng 68 4and6 8 9 Run a reagent blank and at least one standard (to check calIbratIon curve dnft) WIth each group ofsamples LIght Path em 1 2 5 10 650 nm 40-300 20-150 7-50 4-30 Siltea In 56 5 ml FInal volume, ug 815 nm 20-100 10-50 4-20 2-10 SelectlOn of LIght Path Length for VarIous Siltca ConcentratIons 68 14 VIsual companson 6 8 14 1 Prepare not less than 12 standards covenng the range of 0 to 120 ug 8102 by plaCIng the calculated volumes of standard SIlIca (5 8) In 50 ml Nessler tubes, dl1utIng to the mark and develop the calor as In 682-6811 370 1-4PDF Image | Methods for Chemical Analysis of Water and Wastes
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