Hach DR2400 - Page 798

Zinc
© Hach Company, 2003. All rights reserved. Printed in the U.S.A. 3/04 1ed
Page 4 of 4 Zinc_UniCell_Other_PAR_Eng_Ody.fm
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Method Performance
Precision
Standard: 2.00 mg/L Free Zn
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
Zinc ions form a water soluble orange-red complex with
4-(2-pyridylazo)-resorcinol (PAR) at pH 5. The results are measured at 490 nm.
Required Reagents
Description Unit Cat. No.
Zinc - Zn, UniCell™ HCT 170
*
......................................................................................... 23/pkg.............. HCT 170
Optional Apparatus
Flask, volumetric, 100-mL ................................................................................................. each....................14574-42
Graduated cylinder, mixing, 100-mL............................................................................... each....................20886-42
Pipettor, (Jencons) 1–5 mL................................................................................................. each....................27951-00
Replacement tips for 27951-00 .......................................................................................... pk/100...............27952-00
Pipettor, (Jencons) 100–1000 µL........................................................................................ each....................27949-00
Replacement tips for 27949-00 .......................................................................................... pk/400...............27950-00
pH Paper.............................................................................................................................. pk/100...............26013-00
Required Apparatus
Adapter, 16-mm Cell .......................................................................................................... each....................59457-00
Optional Reagents
Nitric Acid Solution, 1:1 .................................................................................................... 500 mL.................2540-49
Sulfuric Acid Standard Solution, 1.00 N ......................................................................... 1 L ........................1270-53
Sodium Hydroxide, 5 N..................................................................................................... 1 L ........................2450-53
Zinc Standard Solution, 1000-mg/L as Zn ..................................................................... 100 mL...............14177-42
Program 95% Confidence Limits of Distribution
809 1.63–2.37 mg/L Free Zn
Program Portion of Curve ∆Abs ∆Concentration
809 1.00 0.010 0.085 mg/L Free Zn
809 3.00 0.010 0.087 mg/L Free Zn
809 5.00 0.010 0.090 mg/L Free Zn
* Available in Europe only