Hanna Instruments HI 3898 User Manual

Page 2

Accessories

Interferences

Strong acidic or basic conditions: adjust pH (6.5-9.0) before
performing the test.
Bromide, iodide and cyanide give higher results.
Sulfide, sulfite and thiosulfate ions anticipate the color
change to orange-brown.

The chemicals contained in this test kit may be hazardous if
improperly handled. Read Health and Safety Data Sheets
before performing the test.

Health and Safety data Sheets

HI 731342

2000 L automatic pipette

HI 731352

tips for 2000 L automatic pipette (4 pcs)

HI 740142

1 mL graduated syringe

HI 740143

1 mL graduated syringe (6 pcs)

HI 740144

tips for 1 ml graduated syringe (6 pcs)

HI 731318

Tissue for wiping cuvets (4 pcs)

HI 731331

Glass cuvets (4 pcs)

HI 731335

Caps for cuvets (4 pcs)

HI 93703-50 Cuvets cleaning solution (230 mL)

Bibliography

ISO 15705:2002.

SCREENING TEST PROCEDURE for COD - EPA

• Using the clean 1.0 ml syringe with tip, add exactly

1.0 mL of HI 3898-0 reagent to the cuvet.

• Cap the cuvet with the plastic stopper and shake

vigorously to mix.

• If the color of the solution turns orange-brown, then the

concentration of chloride ions in the sample is below
2000 ppm.
A direct COD measurement of the sample according to
the EPA method is possible.
If the color of the solution remains yellow, then the
concentration of chloride ions in the sample is above
2000 ppm. In this case, before running a COD test,
dilution of sample is required until the chloride
concentration drops below 2000 ppm.

• If the color of the solution turns orange-brown, then the

concentration of chloride ions in the sample is below
1000 ppm.
A direct COD measurement of the sample according to
the ISO method is possible.
If the color of the solution remains yellow, then the
concentration of chloride ions in the sample is above
1000 ppm. In this case, before running a COD test,
dilution of sample is required until the chloride
concentration drops below 1000 ppm.