Camlab Lovibond MD 610, Инструкция по эксплуатации

Страница: 258 / 371

252
MD 610_2d 11/2019
Pre-Concentration
Pre-concentration usesexactly the same procedure as interference removal, except a
greater volume of sample is used in step 1, instead of deionised/tap water.
For calculation of the original sample concentration a concentration factor should be
considered:
If a 50 ml sample is used the concentration factor is 20/50 = 0.4
If a 100 ml sample is used the concentration factor is 20/100 = 0.2
This can be extended asrequired in order to concentrate the polyacrylate/polymer
sufficiently for analysis.
Example:
If the reading is 20 mg/l and 50 ml are taken for pre-concentration the original
concentration should be calculated as 20 * 0.4 = 8 mg/l.
Note:
Samplesexceeding 10,000 TDSshould be diluted prior to loading onto the cartridge. Take
this dilution into consideration when working out the overall concentration factor.
Cartridge Preparation
1. Removethe plunger of the 20 ml syringe from the barrel and attach the C18 cartridge.
2. Add 5 ml of KS336 (Propan-2-ol) to the syringe barrel, attach the plunger and pass
dropwise through the cartridge. Discard the eluent to waste.
3. Removeplunger and fill the syringe barrel with 20 ml of deionised/tap water. Attach
the plunger and passdropwise through the cartridge. Discardthe eluent to waste. The
cartridge is now ready to be used/reused.