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<p>The mud solution was isolated from mud in Ulziit lake and have been determined their chemical composition. Mud solution was obtained by pressing method, water soluble by extracting with water.<br />Yield of solution (in natural mud) was 18.1%, yield of water extract was 17.05%, dry residue in mud solution and water extract were 18.37% and 17.96%, respectively.<br />In mud solution were anions with following concentration: Cl- (52895 mg/l), SO<sup>4</sup><sub>2</sub>-(2650 mg/l), NO<sub>2</sub>- (11.2 mg/l), NO<sub>3</sub>-(0.0 mg/l), HCO<sub>3</sub>- (1830 mg/l), kations with following concentration: NH<sub>4</sub>+- (2.4 mg/l) , Fe<sup>3+-</sup>(0.0 mg/l), Fe<sup>2+-</sup>(0.0 mg/l); in water extract were anions with following concentration: Cl<sup>-</sup> (36476 mg/l), SO<sup>4</sup><sub>2</sub>-(2100 mg/l), NO<sub>2</sub>- (0.0 mg/l), NO<sub>3</sub><sup>-</sup>(0.0mg/l), HCO3- (1982.5 mg/l) kations with following concentration: Ca2+(400.8 mg/l), Mg2+(8208 mg/l), NH<sub>4</sub><sup>+-</sup> (2.1mg/l) , Fe<sup>3+-</sup>(0.0 mg/l), Fe<sup>2+-</sup>(0.0 mg/l). The content of macro and microelements in mud solution was 0.0003->3%.<br />The mud solution of Ulziit lake was extracted by chloroform and investigated by chromato-mass-spectral method. This analysis shows that mud solution contains hydrocarbons 14.87%, dialkylphtalates 48.15%, organic acids 36.97%, respectively.</p
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