Hach DR2400 - Section 5 Procedures Explained; Sulfide Method 8131 Methylene Blue Method

Procedures Explained
5940022ProceduresExplained.fm Page 63
Section 5 Procedures Explained
DR/2400
Sulfide
Sulfide_None_Other_MLB_Eng_Ody.fm Page 1 of4
• Analyze samples immediately. Do not preserve for later analysis.
• Avoid excessive agitation of samples to minimize sulfide loss.
• Some sulfide loss may occur if dilution is necessary.
• Wipe the outside of sample cells before each insertion into the instrument cell holder. Use a damp towel followed by a dry one to
remove fingerprints or other marks.
• Sulfide 2 reagent contains potassium dichromate. The final solution will contain hexavalent chromium (D007) at a
concentration regulated as a hazardous waste by Federal RCRA. Please see
Section 4 for further information on proper disposal
of these materials.
Sulfide
(Method 8131
Methylene Blue Method*
* Adaptedfrom Standard Methods for the Examination of Water and Wastewater.
(5 to 800 µg/L)
Scope and Application: For testing total sulfides, H
2
S, HS
–
,and certain metal sulfides in groundwater,
wastewater brines, and seawater; USEPA Approvedforreporting wastewater analysis**
** Procedure isequivalenttoUSEPA method 376.2 and Standard Method4500-S
2–
Dfor wastewater.
1. Touch
Hach Programs.
Select program
690 Sulfide.
Touch
OK.
2. Avoidingexcess
agitation of thesample,
use a pipet to add 25mL
of sampletoasample cell
(the prepared sample).
3. Measure25mLof
deionized waterinto a
second sample cell
(theblank).
4. Usingthe calibr ated
1-mL dropper,add
1.0 mL of Sulfide 1
Reagenttoeach cell.
Swirl to mix.
Tips and Techniques
10 mL
20 mL
25 mL
Method 8131
Hach Programs
10 mL
20 mL
25 mL
LINEF
ILL
LINE
10 mL
20 mL
25 mL
10 mL
20 mL
25 mL
10 mL
20 mL
25 mL
Method
Identification
Number
Types of
samples
analyzed
Reference
for USEPA
approval or
acceptance
Instrument
display
Procedure
step
Keystrokes
required
Approval of Acceptance of
method by United States EPA
where applicable
Procedure
Name
Name of
method
used
Additional
Information
that may b
e
applicable
Illustration
of
procedure
steps
Reference
for method
used
Range with
units of
measure