Gilson pipetman - Page 31

ENGLISH
- 31 -
Temperature Air pressure (hPa)
(°C) 800 853 907 960 1013 1067
15 1.0018 1.0018 1.0019 1.0019 1.0020 1.0020
15.5 1.0018 1.0019 1.0019 1.0020 1.0020 1.0021
16 1.0019 1.0020 1.0020 1.0021 1.0021 1.0022
16.5 1.0020 1.0020 1.0021 1.0022 1.0022 1.0023
17 1.0021 1.0021 1.0022 1.0022 1.0023 1.0023
17.5 1.0022 1.0022 1.0023 1.0023 1.0024 1.0024
18 1.0022 1.0023 1.0024 1.0024 1.0025 1.0025
18.5 1.0023 1.0024 1.0025 1.0025 1.0026 1.0026
19 1.0024 1.0025 1.0025 1.0026 1.0027 1.0027
19.5 1.0025 1.0026 1.0026 1.0027 1.0028 1.0028
20 1.0026 1.0027 1.0027 1.0028 1.0029 1.0029
20.5 1.0027 1.0028 1.0028 1.0029 1.0030 1.0030
21 1.0028 1.0029 1.0030 1.0030 1.0031 1.0031
21.5 1.0030 1.0030 1.0031 1.0031 1.0032 1.0032
22 1.0031 1.0031 1.0032 1.0032 1.0033 1.0033
22.5 1.0032 1.0032 1.0033 1.0033 1.0034 1.0035
23 1.0033 1.0033 1.0034 1.0035 1.0035 1.0036
23.5 1.0034 1.0035 1.0035 1.0036 1.0036 1.0037
24 1.0035 1.0036 1.0036 1.0037 1.0038 1.0038
24.5 1.0037 1.0037 1.0038 1.0038 1.0039 1.0039
25 1.0038 1.0038 1.0039 1.0039 1.0040 1.0041
25.5 1.0039 1.0040 1.0040 1.0041 1.0041 1.0042
26 1.0040 1.0041 1.0042 1.0042 1.0043 1.0043
26.5 1.0042 1.0042 1.0043 1.0043 1.0044 1.0045
27 1.0043 1.0044 1.0044 1.0045 1.0045 1.0046
27.5 1.0044 1.0045 1.0046 1.0046 1.0047 1.0047
28 1.0046 1.0046 1.0047 1.0048 1.0048 1.0049
28.5 1.0047 1.0048 1.0048 1.0049 1.0050 1.0050
29 1.0049 1.0049 1.0050 1.0050 1.0051 1.0052
29.5 1.0050 1.0051 1.0051 1.0052 1.0052 1.0053
30 1.0052 1.0052 1.0053 1.0053 1.0054 1.0055
APPENDIX 3  EVAPORATION LOSS
Procedure for the determination of evaporation loss
Use the same distilled water, weighing vessel and balance as you will be using for the gravimetric
check.
1. Halffilltheweighingvesselwithdistilledwater.
2. Covertheweighingvesselwithitslidandplaceitonthebalanceusingapairoftweezers.
3. Aspirateasample.
4. Tarethebalanceandtaketheweighingvesseloutofthebalance.
5. Take off the lid with tweezers.
6. Dispense the sample into a dummy vessel.
7. Replacethelidontheweighingvesseland,usingtweezers,replacethevesselonthebalance.
8. Readthenegativeresulte
1
(record the absolute value).
9. Repeatsteps3to8,threetimestoobtaine
2
, e
3
, and e
4
.
10. Calculate the evaporation loss e using the formula:
 In normal conditions, this value is usually between 0.01 mg
and 0.03 mg.
e = (e1 + e2 + e3 + e4)
1
4