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Вопрос № 1056228 - Экология

Rural population  tend cattle and small ruminants  close to zinc-lead enterprise. In the grazing land there is high concentration of lead (Pb). In ground waters (mine wells) the average concentration of lead reaches 0,6 mg/l. The concentration of lead (Pb) content in meat is 2 mg/kg,  in milk it is 0,3 mg/l, in bread – 0,6 mg/kg, in potatoes – 1 mg/kg. Person’s daily requirement for products is as follows: drinking water – 2 l, meat – 0,1 kg, milk – 0,8 l, bread – 0,1 kg, potatoes – 0,3 kg. Admissible  daily lead (Pb) intake  recommended by World Health Organization equals 0,43 mg. Actual lead (Pb) daily intake coming with water and food is ______ mg. (Give your answer as a whole number.)
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Вопрос задал(а): Анонимный пользователь, 13 Ноябрь 2020 в 18:03
На вопрос ответил(а): Анастасия Степанова, 13 Ноябрь 2020 в 18:03

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Прочитайте текст.
Lead is now a very expensive metal. At one time it was used extensively for roofing and for water piping because of its softness and resistance to corrosion. But later copper and iron have taken its place. Lead is a gray malleable metal which melts at 327 ̊C, which is low for a metal. Lead is still used for roofing and for making waste pipes and sink traps because it is easily bent into shape; storage battery (accumulator) plates; storage tanks for sulphuric acid; lead shot; solder; screens to stop harmful radiation from radioactive substances. Lead monoxide is used for making glass that is brilliant and sparkling, i.e. decorative tableware.
Закончите предложение:
Lead melts at 327 °C, which is …
common for all metals
used for making glass
high for a metal
low for a metal

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