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Chloride Analysis
by wacle 2012-01-09 18:05:14
451 Views, 스크랩 스크랩

                Chlorides Analysis

Water evaporation tends to concentrate non-volatile solids in a waste stream. Thus chlorides

and its related corrosion increase as the volume of the waste stream decreases.  In order to

obtain the maximum life from the Evaporator, it is important to monitor the chloride content

of the liquid in the evaporation tank so the waste can be purged from the unit prior to

damage by chloride corrosion. Evaporator is marking a low cost chlorides test kit available to

facilitate the  routine detection of the chloride levels in the waste stream. The Evaporator part

number for the chloride tester is #7-8204, the vials and precipitate solution is #7-8205.

The following are the operational procedures to utilize the Colorimeter.

 

Discussion: The Colorimeter is sensitive from 5-300 ppm chlorides. To expand that  range,

 we recommend that the sample be diluted. A dilution of 1 cc of waste stream into 9 cc of

distilled water will expand the range tenfold(to50-3,000 ppm chlorides). A dilution of 1 cc of

waste stream into 99 cc of distilled water will expand the range to500-30,000 ppm chlorides.

As the waste stream is diluted, the detection accuracy can be affected by slight inaccuracies in

sample volume control as you mix the diluted samples. Using normal care however, will

produce sufficiently accurate data in our applications.

 

Procedure: Consider a waste stream where the chlorides estimated to be 800 ppm.

1)      Add two cc’s of waste stream to 18 cc’s of distilled water and mix thoroughly.

2)      Select one of the uncapped empty vials and fill about 3/4 full with the

diluted sample to be tested. Wipe the vial clean and insert into the curvette

holder of the EZ1200

3)      Using the FILTER SELECT SWITCH, slide it to the “A” position. Insert

the CHLORIDE Meter Scale into the meter.

4)      Press the red POWER BUTTON on the side and adjust the meter needle to

the “0” position on the meter scale using the ZERO ADJUST thumb wheel.

Remove this vial.

5)      Uncap one of the red and green capped vials and add only 5 cc’s of the sample

to be tested; recap and shake vigorously for 5 seconds; uncap and add 10

drops of chloride reagent #2 into the vial and shake vigorously again

for 10 seconds; Wipe the vial clean with a dry tissue and very gently insert

the sample vial into the curvette holder. Let stand for 15 minutes to allow

the precipitate to settle. Handle the EZ1200 carefully so as nor to disturb

the precipitate while reading the meter. Variations in readings can occur with

the same sample if the equipment is handled in an abrupt fashion.

6)      After 15 minutes, press the red POWER BUTTON and read the ppm of

chloride from the meter scale. Remember to multiply this reading by the

dilution ratio (10 in this case) to get the actual value of chlorides since the

sample was diluted by 10X in the first step.

7)      Discard the red and green capped vial. Wash and rinse the other

glassware thoroughly with distilled water and set aside for other tests.

 

         CAUTION: Always, always remember to multiply the meter reading by the dilution ratio if

applicable. Not all samples require dilution. Only those with chlorides estimated to be in excess

of 300 ppm should be diluted.          

 
 
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