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EC number: 500-302-7 | CAS number: 113930-69-1
The NOELR for growth rate was at least 100 times greater in the test with humic acid, indicating a mitigating effect of humic acid on BADGE-MXDA (#42).
The purpose of this study was to assess the effects of BADGE-MXDA (#42) to the freshwater green alga, Pseudokirchneriella subcapitata, over a 72-hour static exposure period. These data were used to determine EL50 (the loading rate causing 50% inhibition) values for 72-hour cell density, 0-72-hour cell yield, and average specific growth rate from 0 to 72 hours. When possible, NOELR (no-observable-effect loading rate, the highest loading rate not significantly different from the controls) values were determined. BADGE-MXDA (#42) has low aqueous solubility and therefore test solutions were prepared from a water accommodated fraction (WAF). BADGE-MXDA (#42) possesses cationic properties and was, therefore, tested in line with the OECD (2000) recommendation for testing substances with cationic properties for the mitigating effect of humic acid. The results of the test are as follows: Without Humic Acid: 72 hour cell density EL50 >0.60 mg/L NOELR ≥ 0.60 mg/L; 0-72-hour cell yield EyL50 >0.60 mg/L; NOELR ≥ 0.60 mg/L; 0 -72 hour growth inhibition ErL50 >0.60 mg/L NOELR = 0.27 mg/L. With 10 mg Humic Acid/L: 72 hour cell density EL50 >30 mg/L; NOELR ≥ 30 mg/L; 0 -72 -hour cell yield EyL50 >30 mg/L NOELR ≥ 30 mg/L; 0 -72 hour growth inhibition ErL50 >30 mg/L; NOELR ≥ 30 mg/L. The NOELR for growth rate was at least 100 times greater in the test with humic acid, indicating a mitigating effect of humic acid on BADGE-MXDA (#42).
One freashwater algal study (Pseudokirchneriella subcapitata)
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