Hach DR/700 - Page 595

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