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EC number: 200-677-4
CAS number: 68-11-1
The test was carried out as described.
The pH value of the tapwater was 7.66 before introducing the test
Change of pH-value with oxidation in shown together with the measured
concentrations in the following table.
* nominal concentration
In aerated tap water - which is comparable to ground water and surface
water - the oxidation of the test material was completed after 1.5 hours
with the theoretical amount of 71.3 % of oxidation product detected. The
first step of oxidation took place during the preparation of the sample
at start point. After one hour ongoing oxidation another unidentified
product evolved at later retention time than DTDGA. The pH value rose
with ongoing oxidation. The unidentified peak is very broad, this is a
hint to an alkaline substance. The area of this peak also decreases
after 23 hours to a value of 60% of its maximum.
The velocity of degradation of thioglycolic acid in oxygen saturated tap
water was such high, that the first sample taken at start point showed
already considerable amount of oxidation product. During degradation an
unidentified peak appeared, but the amount measured in area% decreased
in 22 hours to 60 % of the maximum initial value of this peak after one
hour degradation time.
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