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A river is subject to seasonal pollution by fruit canning factories which are active between June and September every year. A survey carried out on two different days to investigate the flow of water in the river and the nitrate concentrations at a point downstream of the factories gave the following results:
Day 1 Discharge: 5.3 m³/s NO₃⁻: 0.29 mg/L
Day 2 Discharge: 2.2 m³/s NO₃⁻: 0.83 mg/L
Calculate how much nitrogen (N) is flowing down the river on each occasion (kg N/s). Which is the higher value and why?
Sagot :
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