Hanna Instruments HI 83099 User Manual

Page 16

CALCIUM

SPECIFICATIONS

Range

0 to 400 mg/L

Resolution

10 mg/L

Accuracy

±10 mg/L ±5% of reading at 25 °C

Light Source

Tungsten lamp with narrow band interference filter @ 466 nm

Method

Adaptation of the Oxalate method.

REQUIRED REAGENTS

Code

Description

Quantity

Buffer Reagent

4 drops

HI 93752

A-0 Ca Calcium Buffer Reagent

7 mL

HI 93752

B-0 Ca Calcium Oxalate Reagent

1 mL

REAGENT SETS

HI 937521-01

Reagents for 50 tests

HI 937521-03

Reagents for 150 tests

For other accessories see page 132.

MEASUREMENT PROCEDURE

Note: for sample preparation follow the COLORED OR TURBID SAMPLES procedure at page 17.
• Select the

Calcium method using the procedure described in the Method Selection section (see page 12).

• Using the 5 mL syringe add exactly 3.00 mL of sample to the cuvette.

• Use the pipette to fill the cuvette up to the

10 mL mark with the HI 93752A-0 Calcium
Buffer Reagent.

• Add 4 drops of Buffer Reagent.

Calcium

3 mL of sample

• Remove the cuvette and add the content of one packet of

HI 93716-0 DPD reagent. Replace the cap and shake gently
for about 20 seconds to dissolve most of the reagent.

• Reinsert the cuvette into the instrument.

• Press

Timer and the display will show the countdown prior to the measurement or, alternatively, wait

for 2 minutes and 30 seconds and press

Read. When the timer ends the meter will perform the

reading.

• The instrument displays the results in

mg/L of bromine.

INTERFERENCES

Interference may be caused by: Chlorine, Iodine, Ozone, Oxidized forms of Chromium and Manganese.
In case of water with hardness greater than 500 mg/L CaCO

, shake the sample for approximately

2 minutes after adding the reagent.
In case of water with alkalinity greater than 250 mg/L CaCO

or acidity greater than 150 mg/L CaCO

the color of the sample may develop only partially, or may rapidly fade. To resolve this, neutralize the
sample with diluted HCl or NaOH.

Bromine