DR/2400
Nickel
Nickel_PP_Other_HEP_Eng_Ody.fm Page 1 of 6
• For more accurate results, determine a reagent blank value for each new lot of reagent. Follow the procedure using deionized
water in place of the sample. Subtract the reagent blank value from the final results or perform a reagent blank adjust. See the
instrument manual for more information on Running a Reagent Blank.
• Make the cotton plug pea-size. A larger plug will restrict the flow; a smaller plug may become dislodged from the delivery tube of
the funnel.
• Chloroform (D022) solutions are regulated as hazardous waste by the Federal RCRA. Do not pour these materials down the
drain. Water saturated with chloroform, chloroform solutions, and the cotton plug used in the delivery tube of the separatory
funnel should be collected for disposal with laboratory solvent wastes. See Section 4 on page 55 for more information on proper
disposal of these materials.
• 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.
Nickel
(Method 8037
Heptoxime Method*
*Adapted from Chemie Analytique, 36 43 (1954)
Powder Pillows
(0.02 to 1.80 mg/L Ni)
Scope and Application: For water, wastewater, and seawater; USEPA accepted for reporting
wastewater analyses (digestion required, see Section 2 for digestion procedure)**
** Procedure is equivalent to Standard Method 3500-Ni D for wastewater
1. Touch
Hach Programs.
Select program
335 Nickel, Heptoxime.
Touch
Start.
2. Measure 300 mL of
sample in a 500-mL
graduated cylinder. Pour
into a 500-mL separatory
funnel.
3. Add the contents of
one Nickel 1 Reagent
Powder Pillow to the
funnel. Stopper and
invert to mix.
4. Touch the timer icon.
Touch
OK.
A five-minute reaction
period will begin.
Tips and Techniques
Powder Pillows Method 8037
Hach Programs
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