DelAgua OXFAM-DELAGUA, Руководство пользователя

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OXFAM-DELAGUA Water Testing Kit — Users Manual
28
2.
Drop one DPD No 1 tablet into the
right hand cell (C12) and one
Phenol Red tablet into the left hand
cell (pH).
3.
Replace the lid of the comparator and
push down firmly to seal. Invert the
comparator several times until the 2
tablets have dissolved completely. If
the tablets are slow to dissolve use the
plastic paddle from inside the box of
tablets to crush and mix the tablets in
the sample water. Do not shake the
comparator as this will introduce air.
4.
Immediately read the free chlorine residual (mg/litre) and pH by holding the
comparator up to daylight and matching the colour in the cells with the
standard colour scales. If the colour falls between 2 standard colours, then it
will be necessary to estimate the concentration. Record the result on the daily
report sheet (see Appendix D for an example).
5.
To test for total chlorine residual, DO NOT discard the liquid in the
comparator. Remove the lid and add one DPD No 3 tablet to the right hand
cell (C12).
Add the DPD No 1 and phenol red
tablets
Invert the comparator to dissolve the tablets