Combined Environment Agency and Water Research Centre water results: February and March 1998
| Substance | Highest recorded concentration in water | Standards | |||
|---|---|---|---|---|---|
| UK drinking water standard7 | WHO drinking water guidelines8 | ||||
| Free cyanide (μg/l) | 9.9 | 50 | 70 | ||
| Ammonia (μg N/l) | 2290 | 500 μg NH4/l | 1500 μg NH4/l3-150 | ||
| Benzo(a)pyrene (ng/l) | 18.0 | 10 | 700 | ||
| Total PAHs (ng/l)3-151 | <98.3 | 200 | — | ||
| Phenol (μg/l) (seawater sample) | 0.139 | 0.5 μg C6H5OH/l | — | ||
| Mercury (μg/l) (seawater sample) | 0.31 | 1 | 1 | ||
| Lead (μg/l) | 4.3 | 50 | 10 | ||
| Arsenic (μg/l) | 4.01 | 50 | 10 | ||
| Chromium (μg/l) | 29.4 | 50 | 50 | ||
| Manganese (μg/l) | 180 | 50 | 1003-152 | ||
| Iron (μg/l) | 1400 | 200 | 3003-153 | ||
The highest recorded results are from seepage samples, except where specified as sea water.
Numbers in bold indicate recorded concentrations that are above the specified standards.
—No standard available.
↵3-150 Set for customer complaints for odour and taste. No health based guideline value.
↵3-151 Total PAHs=sum of fluoranthene, benzo(b)fluoranthene, benzo(k)fluoranthene, benzo(a)pyrene, benzo(ghi)perylene, and indeno (1,2,3-cd)pyrene.
↵3-152 Set for customer complaints for staining of laundry and sanitaryware. Health based provisonal guideline value is 500 μg/l.
↵3-153 Set for customer complaints for staining of laundry and sanitaryware. No health based guideline value.