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Environmental fate & pathways

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The environmental fate properties of KMPS triple salt were investigated in hydrolysis studies, synthetic pool water, a degradation in soil study, a decomposition study in activated sludge from a sewage treatment plant (STP), an adsorption/desorption study and the calculation of Henry’s law constant. The hydrolysis of KMPS triple salt was investigated in two key studies and three supporting studies. The degradation of KMPS triple salt in aqueous solutions is pH and temperature dependent. Degradation is accelerated with increasing temperature and increasing pH. The soil degradation study with KMPS triple salt showed, that it decomposes rapidly upon contact with soil. The half-life (DT50) value of KMPS triple salt in soil was conservatively calculated at < 11 minutes. After one hour exposure no measurable KMPS triple salt was present in soil samples. A study using synthetic pool water demonstrated that the decomposition of KMPS triple salt in water is dependent on the presence of oxidisable compounds. The addition of a ‘body fluid analogue’ to the synthetic pool water used in this laboratory test reduced the half-life decomposition of KMPS triple salt from ca. 120 hours (synthetic pool water without ‘body fluid analogue’) to ca. 3 hours. The decomposition study in activated sludge demonstrated that KMPS triple salt will degrade rapidly if released to a STP. In the study, KMPS triple salt decomposed to below 100 ppm from an initial concentration of 300 ppm within 10 minutes. The initial half-life was less than 1 minute. An adsorption/desorption study following OECD Guideline 121 study was performed to determine the soil adsorption coefficient (Koc) of KMPS tripe salt, resulting in a log Koc < 1.25. The calculated Henry’s law constant was 2.87E-07 Pa x m³ x mol-1and shows that KMPS triple salt is not volatile. All biodegradation studies were waived, as biodegradation studies are not applicable for inorganic substances.