“…In previous studies, we found that the physicochemical parameters of water from Lake Sorbulak do not exceed the established Marginal Propensity to Consume (MPC) levels (which is a regulatory requirement), with the exception of the concentration of lead, phenols, polyphosphates. In water extracts from sludge sites, normalized values are exceeded for almost all indicators, the level of which increases with increasing shelf life of sludge (Ibragimova et al, 2019a;2019b).…”