Hach DR2400 - Page 364

Lead
© Hach Company, 2003. All rights reserved. Printed in the U.S.A. 3/04 1ed
Page 4 of 4 Lead_UniCell_Other_PAR_Eng_Ody.fm
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Method Performance
Precision
Standard: 1.00 mg/L Free Pb
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
Lead (II) ions react at pH 9 with 4-(2-pyridylazo)-resorcinol (PAR) to form a
red complex. Measurements are taken at 520 nm.
Required Reagents
Description Unit Cat. No.
Lead - Pb, UniCell™ HCT 152.......................................................................................... 24/pkg.............. HCT 152
Optional Reagents
Lead Standard Solution, 100-mg/L as Pb....................................................................... 100 mL...............12617-42
Metal Prep Set ..................................................................................................................... 50 digestions.... HCT 200
Required Apparatus
Adapter, 16-mm Cell .......................................................................................................... each....................59457-00
Optional Apparatus
Flask, volumetric, 100-mL, Class A.................................................................................. each....................14574-42
Graduated cylinder, mixing, 100-mL............................................................................... each....................20886-42
Pipettor, (Jencons) 1–5 mL................................................................................................. each....................27951-00
Replacement tips for 27951-00 .......................................................................................... 100/pkg.............27952-00
Pipettor, (Jencons) 100–1000 µL........................................................................................ 1 each.................27949-00
Replacement tips for 27949-00 .......................................................................................... 400/pkg.............27950-00
pH Paper.............................................................................................................................. 100/pkg.............26013-00
Program 95% Confidence Limits of Distribution
286 0.76–1.24 mg/L Free Pb
Program Portion of Curve ∆Abs ∆Concentration
286 Entire range 0.010 0.08 mg/L Free Pb