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EC number: 629-661-9 | CAS number: 83834-59-7
1. NL small pond: Total use of sunscreen agents along the shore is 1000 visitors*0.5*3*10 g/day = 15 kg per day. With the assumption that 20 % is released during swimming and 7 % UV-filter content, the surfacewater concentrations becomes:
0.2*15*1000*0.07 kg / 141000 m^3 = 1.5 µg/L.
2. Swiss lakes:
a. With the estimated daily use of 13 g sunscreen agents containing 10 % of UV-filter, an estimated loss to swimming water of 50 % and based on recreational statistics on visitors along the lake, the total emission results in UV-filter concentrations in the surface water ranging from 0.25 to 4 µg/L and sediment concentrations from 0.6 to 2.5 mg/kg (Poiger et al, 2001).
b. Specific for the test substance (in this report called OMC) another assessment was made by Roche based on estimation of waste (10 %), release to natural water during swimming (5 %), 75 % to STP and 25 % in swimming pools. The estimated concentrations range from 0.002 to 0.071 µg/L and sediment levels from 3 to 15 mg/kg.
As part of a literature study on the environmental risk of sunscreen agents environmental concentrations of UV-filters were estimated based on well-founded assumptions. One of the ingredients was the test substance, here called OMC. Generic predictions of concentrations of UV filters in surface water suggest that the concentration levels vary from 1.5 µg/L (NL), 0.25 - 4 µg/L or 0.002 - 0.071 µg/L (both in Switzerland). Predicted concentrations in sediment range from 0.6 to 15 mg/kg. The report concludes that these predictions are too high by three orders of magnitude when compared to measured concentrations.
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