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Excess natural and technogenic chemical exposure have a negative impacts on the regulatory systems of the body. This leads to a decrease in its resistance and adaptabilities. The child`s body is the most vulnerable to the impact of adverse environmental factors owing to the age characteristics. Strontium belongs to the group of metals that can form an improper quality of drinking water, and is also included in the list of the main indicators of water quality according to the requirements of sanitary standards of t...