APFIVE Interpreting Phosphate Concentration Data
Which of the following conclusions is best supported by the evidence that the calculated additional phosphate concentration in the river is $$0.025\,mg/L$$?
TABLE:
| Source | Discharge Rate (mg/min) | River Flow Rate (L/min) |
|---|---|---|
| Manufacturing Facility | 2500 | 1*10^5 |
| Calculated Increase: $$C = \frac{2500}{1*10^5} = 0.025\,mg/L$$ |
A
Despite the small concentration, the discharge will doubly impact the river because phosphates remain concentrated in the water due to low solubility.
B
The increase of $$0.025\,mg/L$$ indicates that immediate remediation is necessary to prevent a potential algal bloom.
C
The small increase of $$0.025\,mg/L$$ suggests that the point‐source phosphate discharge is unlikely to be the sole cause of cultural eutrophication in the river.
D
The calculated phosphate level demonstrates that phosphate is accumulating rapidly, leading to hazardous water quality and fish kills.
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