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EC number: 203-733-6
CAS number: 110-05-4
Three sets of samples (in duplicate)
were analyzed 24, 48 and 72 hours after weighing of the test substance
Trigonox B and addition of water. The concentration of the test
substance was quantified using Head-space GC Chromatography. Table 6.1
presents a summary of the three sets of tests performed. The amount of
test substance weighed at the start of the test, the pH of the dilutions
and the calculated results after analysis are all displayed in Table 1.
Table 6.1: Analysis results of
Trigonox B water solubility
(hours after weighing)
Amount of test substance in water
Trigonox B concentration
859 – 813
10.67 – 9.96
170 – 169
949 – 842
10.09 – 9.89
179 – 170
1232 - 1021
10.11 – 10.11
167 – 171
Table 6.2: Summary of the results
of Trigonox B water solubility
Test time(hours after weighing)
Amount oftest substance
Difference between solubilities (%)*
Average water solubility (mg/L)
* According to the guideline the
repeatability of two individual results must be less than 15% before
The water solubility of di- tert- butyl
peroxide was determined according to OECD test guideline 105. The
flask method was used to perform the water solubility test because a
literature search and a preliminary study indicated that the water
solubility would be >100 mg/l. Head- space gas
chromatography was used to determine the concentration of the test
substance in water. The average water solubility of
di- tert- butyl peroxide in this study was determined to be 171 mg/l.
Di-tert-butyl peroxide has a water solubility of 171 mg/L at 20°C and pH 8.1.
This low solubility is supported by calcualted
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