Hach DR/700 Procedures Manual page 595

MOLYBDENUM, MOLYBDATE, LR
Negative Interference:
Ion
Iron
Copper
6+
Chromium (Cr )
Chloride
AMP (Phosphonate)
Phosphonohydroxyacetic Acid
Bisulfate
Nitrite
Aluminum
Acrylates
Alum
Lignin Sulfonate
Orthophosphate
Bicarbonate
EDTA
Borate
Ethylene Glycol
Sulfite
Diethanoldithiocarbamate
*Read the molybdenum concentration immediately after the two-minute reaction period.
Positive Interference:
Ion
Carbonate
Silica
Benzotriazole
No Interference:
Ion
Zinc
Calcium
Magnesium
Manganese
Chlorine
PBTC (phosphonate)
Sulfate
Bisulfite
Nickel
Level above which
it interferes (mg/L)
200
98
4.5*
1,400
15
32
3,300
350*
2
790
7
105
4,500
5,650
1,500
5,250
2% (by volume)
6,500
32
Level above which
it interferes (mg/L)
1,325
600
210
Highest Concentration
Tested (mg/L)
400
720
8,000
1,600
7.5
500
12,800
9,600
250
61-39
continued