May be fatal
if swallowed or absorbed thrugh skin.
Do not get
in eyes, on skin, or on clothing.
Do not pipet by mouth.
If swallowed, induce
vomiting by sticking finger down throat or by
giving soapy or strong salty water to drink.
Repeat until vomit is clear.
Never give anything
by mouth to an unconscious person.
In case of
immediately flush eyes or skin with
plenty of water for at least 15 minutes while
removing contaminated clothing and shoes.
clothing before re-use.
shoes.) Keep away from children.
(a) Place a chlorine color comparator disc in the comparator.
(b) Thoroughly rinse two rectangular comparator cells and fill
both cells with the water sample to the etched mark (15 ml) on the
(c) Position the prism eyepiece.
Hold the comparator in one
hand with the eyepiece facing you, and place the two water-filled
cells into the openings at the top of the comparator.
arsenite and orthotolidine bottles between the index and middle
fingers of the hand holding the comparator.
(d) Fill the droppers in the caps of the arsenite and orthto-
lidine bottles and let the dropper caps sit loosely in the bottles.
Do not screw the caps back on the bottles.
(e) Expel, with force, one dropper full (not less than 0.75
ml) of arsenite (red cap) into the cell in the right-hand opening of
The forceful addition of the orthotolidine and
arsenite to the cells is very important in order to get good mixing of
the chemicals in the water.
Then expel, with force, one dropper full
(not less than 0.75 ml) of orthotolidine (yellow cap) into the same
(f) Refill the arsenite and orthotolidine droppers, and let
the droppers sit loosely in the bottles.
Reading (step (g)) must be made within one minute
of adding the chemicals to the indicator cell.
It is absolutely essential that the chemicals be
introduced in their proper order.