Hanna Instruments hi 3857 Manual Do Utilizador

HEALTH AND SAFETY

REFERENCES

Standard Methods for the Examination of Water and Waste-
water, 18

edition, 1992

layer to separate from the aqueous layer, as described

above. Then, using the long pipette, remove the upper
aqueous layer and dispose of it.

13- Repeat from step 10 to 12. The colored chloroform layer

is the reacted sample.

14- Insert the reacted sample into the right hand opening

of the checker disc.

15- Hold the checker disc

so that a light source
illuminates the samples
from the back win-
dows.

16-Rotate the disc while looking at the color test windows

and stop when you find the color match. Read the
value in the result window and record it in mg/L (or
ppm) of Detergents (LAS and/or ABS).

17- If the color is too

intense to make a
color match, then
the original sample
needs to be di-

luted. In this case,
using the 1 mL

The chemicals contained in this kit may be hazardous if
improperly handled. Read Health and Safety Data Sheet

before performing this test.

1 mL

of sample

plastic pipette, add to the vial 1 mL of sample. Fill the

vial with demineralized water up to the 20 mL mark
exactly. Follow the procedure from step 5 to step 16 and
multiply the result obtained by 20. The blank is pre-
pared in the same way as described in point 3.

18- Before starting a new test rinse the glass vials and the

1 mL plastic pipette several times with sample to be
analyzed. Rinse the glass vials and the 1 mL plastic
pipette in tap water before storing.

Note: Do not mix up the plastic pipettes!

Always use the 3 mL pipette for adding the Chloro-
form, the long pipette for removing the aqueous layer

and the 1 mL pipette for adding the sample.

For best results: Intensely colored samples will make the

color matching determination difficult and they should
be adequately treated before performing the test.
Suspended matter in large amounts should be
removed by prior filtration.
The temperature should be higher than 15°C, other-
wise the sample may become turbid.

Caution: Ultraviolet radiation may cause fading of colors.

When not in use, keep the disc protected from light,
in a cool and dry place.