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SPECIFICATIONS
Range
0 to 150 mg/L
Resolution
5 mg/L
Accuracy
±5 mg/L ±3% of reading
Light Source
Tungsten lamp with narrow band interference filter @ 466 nm
Method
Sulfate is precipitated with barium chloride crystals. Light absorbance of the suspension
is measured.
REQUIRED REAGENTS
Code
Description
Quantity
HI 93751-0
Indicator reagent
1 packet
REAGENT SETS
HI 93751-01
Reagents for 100 tests
HI 93751-03
Reagents for 300 tests
For other accessories see page 17.
MEASUREMENT PROCEDURE
Note: for sample preparation follow the IRRIGATION WATER (LR) procedure on page 17.
• Select the
Sulfate method using the procedure described
in the
Method Selection section (see page 12).
• Fill a cuvette with 10 mL of unreacted sample (up to
the mark) and replace the cap.
• Place the cuvette into the holder and close the lid.
• Press ZERO key. The display will show “-0.0-” when
the meter is zeroed and ready for measurement.
• Remove the cuvette.
Sulfate
10 mL
SULFATE
Silver
• Press ZERO key. The display will show “-0.0-” when the meter is zeroed and ready for measurement.
• Fill a second cuvette up to the mark with 10 mL of the reacted sample.
• Insert the second cuvette into the instrument.
• Press READ to start the reading. The instrument displays
the results in mg/L of silver.
Note
:
a temperature above 30°C may cause turbidity. In this case, before zeroing and taking readings,
add 2-3 drops of Dispersing agent (HI 93703-51) to each cuvette and swirl until turbidity is completely
dissolved.
INTERFERENCES
Interference may be caused by:
Al
3+
above 30 mg/L
Fe
2+
above 1.5 mg/L
Ca
2+
above 1000 mg/L as CaCO
3
Fe
3+
above 10 mg/L
Cd
2+
above 20 mg/L
K
+
above 500 mg/L
Cl
-
above 8000 mg/L
Mn
2+
above 25 mg/L
Co
2+
above 1.5 mg/L
Mg
2+
above 1000 mg/L as CaCO
3
Cr
3+
above 20 mg/L
Na
+
above 5000 mg/L
Cr
6+
above 40 mg/L
Ni
2+
above 1.5 mg/L
Cu
2+
above 15 mg/L
Pb
2+
above 20 mg/L
F
-
above 20 mg/L
Zn
2+
above 30 mg/L
10 mL
# 2
# 2