Hanna Instruments HI 4010 - Manual (Page 13)

13
If no fluoride complexing species are in the sample, TISAB
needn’t be added at the same proportions. Add 1 parts
TISAB to 100 parts sample or standard. Ionic strength will
be fixed at approximately 0.02M. Attention: Always pre-
pare samples and standards with the same ISA to volume
ratio.
1) Follow sections VIII and IX to prepare sensors for
measurement.
2) Follow section VI to prepare standards/solution. Stan-
dards should bracket the sample concentration. Stan-
dards and solutions should be at the same tempera-
ture.
1 part of TISAB is added to 100 parts of both samples
and standards. Add stir bar and mix before taking
measurements.
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. Longer equilibrations are re-
quired at lower concentrations (4-5 minutes).
5) To prevent carry over and contamination of samples,
rinse sensors with deionized water and dab dry be-
tween samples.
Typical Linearity for HI 4010 and HI 4110 Sensors
-150.00
-100.00
-50.00
0.00
50.00
100.00
150.00
200.00
250.00
0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00
-Log of Concentration
m V