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EC number: 211-185-4
CAS number: 632-79-1
Study Sample Recoveries for PHT4 in Buffered Solutions of pH 4, 7 and 9
Sample Number 616C-107-)
Nominal Concentration (mg/L)
Sampling Interval (Day)
Analytical Result (mg/L)
Mean Analytical Result (mg/L/SD)
Mean Percent Recovery (%)
Results were generated using Excel 2000 in the full precision mode. Manual calculations with rounded values may differ
The objective of the study
was to determine the rate of hydrolysis of PHT4 in aqueous media in the
environmentally relevant pH range of 4-9 at approximately 25 °C.
The procedures used in the
study were based on those found in the US EPA Product Properties Test
Guideline 835.2110 and OECD Guideline for Testing of Chemicals, 111.
The hydrolytic stability of
PHT4 in the preliminary test was evaluated at pH 4 (acetate buffer), pH
7 (phosphate buffer) and pH 9 (borate buffer) at 50 °C over a five-day
period (Day 0 and Day 5). Samples were prepared at a nominal
concentration of 9.00 mg/L in each buffer and analyzed in triplicate in
Days 0 and 5 of the test. Mean recoveries expressed as a percent of
nominal on Day 0 were 99.3%, 102% and 102% for the pH 4, 7 and 9 levels,
respectively. Mean recoveries expressed as a percent of nominal on Day 5
were 101%, 100% and 102% for the pH 4, 7 and 9 levels, respectively. As
degradation was <10% in the pH 4, 7 and 9 test systems, no further
testing was performed.
Degradation of PHT4 was <10%
in the pH 4, 7 and 9 test systems, therefore, no further testing was
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