Hach DR2400 - Page 732

Silver
© Hach Company, 2003. All rights reserved. Printed in the U.S.A. 3/04 1ed
Page 6 of 6 Silver_PP_Other_CLR_Eng_Ody.fm
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FAX: (970) 669-2932
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Call 800-227-4224
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Summary of Method
Silver ions in basic solution react with cadion 2B to form a green to brown to red-
purple complex. The sodium thiosulfate acts as a decolorizing agent for the
blank. The Silver 1 and Silver 2 reagents contain the buffer, indicator, and
masking agents. Organic extractions are not necessary and this method does not
have as many interferences as the traditional dithizone method. Test results are
measured at 560 nm.
Required Reagents
Quantity Required
Description per test Unit Cat. No.
Silver Reagent Set (50 tests)............................................................................................................................22966-00
Includes:
Silver 1 Reagent Powder Pillow.......................................................1 pillow........... 50/pkg...............22935-66
Silver 2 Reagent Solution Pillow......................................................1 pillow........... 50/pkg...............22936-66
Sodium Thiosulfate Powder Pillow ................................................1 pillow........... 50/pkg...............22937-66
Required Apparatus
Clippers, for opening powder pillows .................................................1 ....................... each........................968-00
Cylinder, graduated, 50-mL ....................................................................1 ....................... each....................21179-41
Cylinder, graduated, mixing, 50-mL......................................................1 ....................... each......................1896-41
Sample Cells, 10-20-25 mL, w/cap.........................................................2....................... 6/pkg.................24019-06
Digestion Reagents
Hydrogen Peroxide, 50%................................................................................................... 490 mL...............21196-49
Phenolphthalein Indicator Solution, 1 g/L..................................................................... 15 mL SCDB .......1897-36
Sodium Hydroxide Solution, 50%.................................................................................... 500 mL.................2180-49
Sodium Hydroxide Solution, 1.00 N................................................................................ 100 mL MDB.......1045-32
Sulfuric Acid, ACS, concentrated..................................................................................... 2.5 L .......................979-09
Thymolphthalein Indicator Solution, 1 g/L ................................................................... 15 mL SCDB .....21853-36
Water, deionized ................................................................................................................. 4 liters ....................272-56
Required Standards
Silver Standard Solution, 1000 mg/L Ag........................................................................ 100 mL...............14613-42
Water, deionized ................................................................................................................. 4 liters ....................272-56
Digestion Apparatus
Boiling Chips, silicon carbide ........................................................................................... 500 g...................20557-34
Digesdahl Digestion Apparatus, 115 V ac, 50/60 Hz.................................................... each....................23130-20
Digesdahl Digestion Apparatus, 230 V ac, 50/60 Hz.................................................... each....................23130-21
Safety Shield, for Digesdahl.............................................................................................. each....................50030-00