Hach DR2400 - Page 146

Chloride
© Hach Company, 2003. All rights reserved. Printed in the U.S.A. 3/04 1ed
Page 4 of 4 Chloride_None_Other_MRT_Eng_Ody.fm
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Method Performance
Precision
Standard: 20.0 mg/L Cl
–
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
Chloride in the sample reacts with mercuric thiocyanate to form mercuric
chloride and liberate thiocyanate ion. Thiocyanate ions react with the ferric ions
to form an orange ferric thiocyanate complex. The amount of this complex is
proportional to the chloride concentration. Test results are measured at 455 nm.
Required Reagents
Quantity Required
Description per test Unit Cat. No.
Chloride Reagent Set (50 Tests)
*
....................................................................................................................23198-00
Includes:
(1) Ferric Ion Solution........................................................................2 mL ................ 100 mL...............22122-42
(1) Mercuric Thiocyanate Solution ..................................................4 mL ................ 200 mL...............22121-29
Water, deionized.................................................................................25 mL .............. 4 liters ....................272-56
Required Apparatus
Sample cells, 10-20-25 mL, with cap ......................................................2 ....................... 6/pkg.................24019-06
Pipet, TenSette
®
, 1.0 to 10.0 mL ..............................................................1 ....................... each....................19700-10
Pipet Tips, for 19700-10 TenSette
®
Pipet ...............................................1 ....................... 50/pkg...............21997-96
Required Standards
Chloride Standard Solution, 1000-mg/L Cl
–
.................................................................. 500 mL...................183-49
Chloride Standard Solution, 2-mL Voluette
®
Ampule, 12,500-mg/L Cl
–
.................. 20/pkg...............14250-20
Program 95% Confidence Limits
70 18.3–21.8 mg/L Cl
–
Portion of Curve ∆Abs ∆Concentration
1.0 mg/L 0.010 0.11 mg/L Cl
–
20.0 mg/L 0.010 45 mg/L Cl
–
* 50 tests equals 25 samples and 25 blanks.