YSI MultiLab 4010-1W, Руководство по эксплуатации

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MultiLab 4010-1W Appendix
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19.3 Calculate the TDS Multiplier
The TDS constant is a multiplier used to calculate an estimated Total Dissolved
Solids (TDS) value from conductivity. The multiplier is used to convert specific
conductance in mS/cm to TDS in g/L. The default value is 0.65. Enter a new
value between 0 and 0.99.
This multiplier is highly dependent on the nature of the ionic species present in
the water sample. To be assured of moderate accuracy for the conversion, you
must determine a multiplier for the water at your sampling site. Use the
following procedure to determine the multiplier for a specific sample:
1. Determine the specific conductance of a water sample from the site.
2. Filter a portion of water from the site.
3. Carefully measure a volume of the filtered water. Completely evaporate
to yield a dry solid.
4. Accurately weight the remaining solid.
5. Divide the weight of the solid (in grams) by the volume of water used (in
liters) to yield the TDS value in g/L for the site.
6. Divide the TDS value in g/L by the specific conductance of the water in
mS/cm to yield the conversion multiplier.
Make sure to use the correct units.
If the nature of the ionic species at the site changes between sam-
pling studies, the TDS values will be in error. TDS cannot be calcu-
lated accurately from specific conductance unless the make-up of
the chemical species in the water remains constant.