Hanna Instruments HI 4007 - Manual (Page 12)

12
Procedure
1) Follow sections VIII and IX to prepare sensors for
measurement.
2) Follow section VI to prepare standards/ solution. Stan-
dards should bracket and fall within the range of
interest.
Two mL HI 4000-00 ISA, or 10 mL acetate pH buffer
or 10 mL of oxidizing reagent is added to 100 mL of
both samples and standards. Add stir bar and mix
before taking measurements. Measurements using
the oxidizing reagent must be made 10 minutes after
mixing and not permitted react longer.
3) Follow section VII; General Guidelines to optimize test
set-up.
4) During calibration it is best to start with lower concen-
tration samples first. Wait for a stable measurement
before recording values. Slightly longer equilibra-
tions are required at lower concentrations .
5) To prevent carry over and contamination of samples,
rinse sensors with DIW and blot dry between samples.
0
50
100
150
200
250
300
0 1 2 3 4 5 6 7
-Log of Concentration
mV
Typical Linearity for HI 4007 and HI 4107 Chloride