Hach DR2400 - Page 293

Formaldehyde
Formaldehyde
Formaldehyde_PP_Other_MBT_Eng_Ody.fm Page 3 of 6
Interferences
Accuracy Check
13. When the timer
shows
2:00, touch Zero.
The display will show:
0 µg/L CH
2
O
14. Pour the prepared
sample into a sample cell.
Wipe the cell and place it
into the cell holder.
15. Wipe the cell and
place it into the cell
holder.
16. When the timer
beeps, touch
Read.
Results will appear in µg/
L CH
2
O.
Zero
10 mL
10 mL
Read
Interfering Substance Interference Levels and Treatments
Acetate Greater than 1000 mg/L
Aldehydes (other) Positive interference at all levels
Ammonium (as N) Greater than 10 mg/L
Aniline Greater than 10 mg/L
Bicarbonate Greater than 1000 mg/L
Calcium Greater than 3500 mg/L
Carbonate Greater than 500 mg/L
Chloride Greater than 5000 mg/L
Copper Greater than 1.6 mg/L
Cyclohexylamine Greater than 250 mg/L
Ethanolamine Greater than 33 mg/L
Ethylenediamine Greater than 1.5 mg/L
Glucose Greater than 1000 mg/L
Glycine Greater than 1000 mg/L
Iron (Fe
3+
) Greater than 12 mg/L
Lead Greater than 100 mg/L
Manganese Greater than 500 mg/L
Mercury Greater than 70 mg/L
Morpholine Greater than 0.36 mg/L
Nitrate Greater than 1000 mg/L
Nitrite Greater than 8 mg/L
Phenol Greater than 1050 mg/L
Phosphate Greater than 200 mg/L
Silica Greater than 40 mg/L
Sulfate Greater than 10,000 mg/L
Urea Greater than 1000 mg/L
Zinc Greater than 1000 mg/L