Hach DR2400 - Page 359

Lead
Lead
Lead_None_Other_LTK_Eng_Ody.fm Page 7 of 8
Method Performance
Precision
Standard: 750.0 µg/L Pb
2+
See Section 3.4.3 Precision on page 44 for more information, or if the standard
concentration did not fall within the specified range.
Sensitivity
See Section 3.4.5 Sensitivity on page 44 for more information.
Summary of Method
Acid soluble lead, as Pb
2+
, in a potable water sample is first concentrated on a
Fast Column Extractor. The lead is then eluted from the Extractor and
determined colorimetrically with an indicator. Test results are measured at
477 nm.
Required Reagents
Quantity Required
Description per test Unit Cat. No.
LeadTrack
®
Reagent Set ..........................................................................1....................... 20 tests/pkg......23750-00
Required Apparatus
Beaker, polypropylene, 150-mL..............................................................1 ....................... each......................1080-44
Beaker, polypropylene, 250-mL..............................................................1 ....................... each......................1080-46
Clamp, two-prong extension ..................................................................1 ....................... each....................21145-00
Clamp holder ............................................................................................1 ....................... each........................326-00
Clippers, for opening powder pillows ..................................................1 ....................... each........................936-00
Cylinder, graduated, polypropylene, 25-mL........................................1 ....................... each......................1081-40
Cylinder, graduated, polypropylene, 100-mL......................................1 ....................... each......................1081-42
Dropper, 0.5 & 1.0 mL marks ............................................................................................ 20/pkg...............21247-20
Sample Cells, 10-20-25 mL, w/cap.........................................................2....................... 6/pkg.................24019-06
Support, ring stand...................................................................................1 ....................... each........................563-00
Digestion Reagents and Required Standards
Lead Standard Solution, 1000-mg/L as Pb..................................................................... 100 mL...............12796-42
Lead Standard Solution, 50-mg/L, 10-mL Voluette
®
Ampules................................... 16/pkg...............14262-10
Lead Standard Solution, 10-mg/L ................................................................................... 25 mL.................23748-20
Nitric Acid, ACS ................................................................................................................. 500 mL...................152-49
Water, deionized ................................................................................................................. 4 liters ....................272-56
Program Standard Deviation of 7 Replicate Standards
283 10.15 µg/L Pb
2+
Portion of Curve ∆Abs ∆Concentration
50 to 150 µg/L 0.010 16
µg/L Pb
2+
0.010 0.010 1.9 µg/L Pb
2+
80 0.010 1.4 µg/L Pb
2+
106 0.010 1.3 µg/L Pb
2+
132 0.010 1.4 µg/L Pb
2+