Statistical data set
Distribution of annual site mean concentrations of certain heavy metals in rivers: 1980 to 2013, Great Britain
Updated 15 October 2014
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| Distribution of annual site mean concentration of certain heavy metals in rivers - 1980-2013 | |||||||||||||||||||||||||||||||||||
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| Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set |
| Great Britain | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set |
| Metals | Site Percentile | 1980 | 1981 | 1982 | 1983 | 1984 | 1985 | 1986 | 1987 | 1988 | 1989 | 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 |
| Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set | Not set |
| Zinc | 90th percentile | 80.2659 | 59.4286 | 55.0714 | 72. | 68.2143 | 63.6875 | 54.5238 | 56.5238 | 55.6677 | 48.3333 | 49.5 | 49.8268 | 48.5526 | 40.4762 | 39.6154 | 38.2414 | 44.0714 | 40.1538 | 60.2 | 37.7333 | 35.99 | 32.6429 | 36.9327 | 33.5667 | 35.6385 | 36.1083 | 37.9458 | 28.725 | 29.4063 | 30.8 | 31.0125 | 26.9583 | 28.6167 | 27.8699 |
| Zinc | 50th percentile | 24.2292 | 20.2143 | 20.25 | 22.2738 | 23.75 | 20.9792 | 19.7592 | 19.3077 | 16.6184 | 13.6703 | 15.4545 | 16.3883 | 15.5473 | 13.5833 | 13.1818 | 13.6667 | 13.2692 | 13.25 | 14.3795 | 11.3083 | 12.5833 | 12.0222 | 12.2014 | 9.9775 | 10.14 | 9.5164 | 10.0046 | 9.6 | 9.6793 | 8.31 | 8.4946 | 8.7225 | 8.895 | 8.6693 |
| Zinc | 10th percentile | 7.5132 | 5.9167 | 6.8333 | 6. | 5.6667 | 5. | 4.65 | 5.25 | 4.2614 | 4.5682 | 5.2667 | 5.4554 | 5.4483 | 3.4545 | 4.2692 | 4.2843 | 4.375 | 4.9167 | 4.5 | 3.8417 | 4.6575 | 4.755 | 4.0641 | 3.7364 | 3.2925 | 4.1833 | 3.7312 | 3.6454 | 4.0027 | 3.2917 | 2.7695 | 2.9608 | 3.5108 | 3.0607 |
| Zinc | No. of sites | 202 | 195 | 197 | 196 | 189 | 184 | 210 | 201 | 204 | 200 | 195 | 196 | 202 | 195 | 195 | 197 | 203 | 195 | 201 | 217 | 225 | 225 | 226 | 227 | 227 | 225 | 226 | 225 | 224 | 225 | 226 | 223 | 225 | 228 |
| Copper | 90th percentile | 19.7708 | 24.1667 | 19.6429 | 19.7 | 24.875 | 18.8864 | 15.6168 | 17.6575 | 14.8043 | 12.8835 | 13. | 12.01 | 10.75 | 10.5748 | 10.2 | 9.4167 | 9.0278 | 9.0395 | 10.68 | 8.7189 | 7.772 | 8.1556 | 7.0938 | 6.31 | 6.55 | 6.0583 | 5.9862 | 5.9467 | 6.4621 | 6.7583 | 5.8463 | 5.5733 | 5.6492 | 5.0623 |
| Copper | 50th percentile | 7.4417 | 7.2143 | 6.9451 | 7.629 | 8.4444 | 6.697 | 5.6271 | 5.4006 | 5. | 4.2846 | 4.5156 | 4.1005 | 4. | 3.8868 | 3.75 | 3.2857 | 2.9583 | 3.6618 | 3.6 | 2.8975 | 3.3089 | 3.1767 | 3.0924 | 2.6875 | 2.8342 | 2.6942 | 2.605 | 2.625 | 2.7498 | 2.7175 | 2.5225 | 2.327 | 2.4033 | 2.3 |
| Copper | 10th percentile | 3.4722 | 2.5 | 3.2817 | 2.5923 | 2.875 | 2.7093 | 2.2917 | 1.9423 | 1.4 | 1.5358 | 1.8542 | 1.4286 | 1.5 | 1.2887 | 1.1417 | 1.0769 | 1.0588 | 1.25 | 1.3167 | 1.0551 | 1.1634 | 1.1683 | 1.1372 | 1.135 | 1.219 | 1.1267 | 1.0163 | 0.9991 | 1.0969 | 1.05 | 0.9866 | 0.9292 | 1.035 | 0.9863 |
| Copper | No. of sites | 202 | 193 | 198 | 196 | 189 | 192 | 200 | 190 | 199 | 194 | 186 | 184 | 187 | 180 | 180 | 197 | 195 | 194 | 201 | 216 | 220 | 221 | 224 | 227 | 227 | 225 | 225 | 225 | 224 | 225 | 226 | 223 | 225 | 227 |
| Lead | 90th percentile | 23.1758 | 21.4764 | 30. | 25. | 19.9274 | 23.75 | 18.4234 | 13.5 | 9.9013 | 10.756 | 9.3158 | 9. | 9.9286 | 8.6077 | 8.7595 | 7.2 | 7.8824 | 6.2784 | 13.3408 | 6.923 | 7.7418 | 5.5291 | 5.8246 | 3.9621 | 6.2834 | 4.5192 | 4.7758 | 3.9308 | 4.4917 | 5. | 4.8192 | 3.5667 | 4.0045 | 3.47 |
| Lead | 50th percentile | 6.75 | 5.8709 | 5.2692 | 5.6667 | 5.4674 | 4.7143 | 4.7727 | 4.6053 | 3.8864 | 3.4659 | 3.5 | 2.4615 | 2.3462 | 2.5 | 1.9844 | 1.48 | 1.3667 | 1.5878 | 2.353 | 1.6667 | 1.9979 | 1.7354 | 1.5111 | 1.1407 | 1.225 | 1.1417 | 1.2417 | 1.2327 | 1.2564 | 1.1417 | 1.1208 | 1.0833 | 1.235 | 1.1667 |
| Lead | 10th percentile | 1.2029 | 1.0931 | 2.0588 | 2.1667 | 2.2576 | 1.5 | 1.6069 | 1.4167 | 1.25 | 1.0732 | 1. | 0.8636 | 0.7083 | 0.7003 | 0.7042 | 0.6071 | 0.5611 | 0.6667 | 0.6995 | 0.4286 | 0.6042 | 0.5 | 0.4411 | 0.5914 | 0.5278 | 0.3917 | 0.3595 | 0.5291 | 0.5288 | 0.3442 | 0.3514 | 0.3439 | 0.463 | 0.5556 |
| Lead | No. of sites | 192 | 188 | 197 | 195 | 180 | 187 | 194 | 185 | 194 | 186 | 189 | 183 | 187 | 180 | 180 | 183 | 184 | 176 | 176 | 177 | 182 | 183 | 185 | 226 | 226 | 225 | 225 | 225 | 224 | 225 | 226 | 223 | 225 | 227 |
| Nickel | 90th percentile | 20.625 | 15.4412 | 13.4524 | 19.4108 | 21.3636 | 14.5844 | 15.8547 | 12.86 | 14.9702 | 13.2542 | 12.7692 | 11.72 | 10.6316 | 9.7143 | 9.2727 | 10.3333 | 9.6556 | 9.375 | 7.9477 | 9.2766 | 7.7326 | 6.7871 | 5.7273 | 5.6621 | 5.4751 | 4.5 | 4.3917 | 4.4167 | 4.5497 | 4.775 | 5.0242 | 4.85 | 4.9044 | 4.5333 |
| Nickel | 50th percentile | 5.875 | 5. | 4.5506 | 5. | 5. | 5. | 5. | 5. | 4.6333 | 4.6189 | 4. | 3.8654 | 3.3333 | 3.1681 | 2.625 | 3.625 | 3.0408 | 2.9808 | 2.9729 | 2.5 | 2.753 | 3.2402 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.0233 | 1.9169 | 2.0317 | 2.0417 | 2. |
| Nickel | 10th percentile | 1.6071 | 1.2055 | 1.5 | 1.6536 | 1.7778 | 1.6333 | 1.6159 | 1.4444 | 2.1688 | 1.5938 | 1.5909 | 0.8636 | 0.7 | 0.6186 | 0.825 | 1.1818 | 1.1774 | 1.5 | 1.5 | 1.4621 | 1.5 | 1.5 | 1.4067 | 1.3881 | 1.5 | 1.4167 | 1.0197 | 1.2712 | 1.3881 | 0.78 | 0.5994 | 0.6215 | 0.6458 | 0.6433 |
| Nickel | No. of sites | 189 | 190 | 196 | 194 | 185 | 188 | 196 | 179 | 186 | 166 | 152 | 161 | 167 | 168 | 167 | 197 | 195 | 194 | 200 | 220 | 219 | 220 | 223 | 226 | 226 | 225 | 225 | 225 | 224 | 225 | 226 | 223 | 225 | 227 |
| Chromium | 90th percentile | 14.8889 | 15. | 11.1364 | 12.5114 | 12.3365 | 8.8075 | 11.1667 | 8.3478 | 7.3636 | 6.8019 | 7.3925 | 8.6333 | 7.9167 | 5.95 | 4.5 | 4.2222 | 4.5 | 4.0857 | 5.8576 | 2.8083 | 2.6479 | 3.1027 | 2.67 | 2.8379 | 2.6421 | 2.0833 | 1.8194 | 2.1858 | 1.596 | 2.0842 | 1.7542 | 1.455 | 1.8446 | 1.9562 |
| Chromium | 50th percentile | 5. | 5. | 4.9167 | 5. | 5. | 5. | 4.7083 | 3.5682 | 2.6935 | 2.5 | 2.5 | 2.4667 | 1.6364 | 1.6875 | 1.2008 | 1.0294 | 0.9583 | 1. | 1.1027 | 0.8731 | 0.9625 | 0.8167 | 0.885 | 0.9967 | 0.8778 | 0.574 | 0.5733 | 0.6 | 0.6108 | 0.5748 | 0.5362 | 0.46 | 0.65 | 0.7222 |
| Chromium | 10th percentile | 1.0357 | 1.6288 | 1.3571 | 1.5858 | 1.9028 | 1.1233 | 1.3333 | 1. | 0.75 | 0.6875 | 0.6583 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.4183 | 0.2792 | 0.3431 | 0.3333 | 0.3375 | 0.3509 | 0.3131 | 0.25 | 0.25 | 0.2958 | 0.2896 | 0.3038 | 0.2733 | 0.25 | 0.3426 | 0.3 |
| Chromium | No. of sites | 189 | 182 | 187 | 194 | 184 | 186 | 195 | 179 | 187 | 168 | 162 | 160 | 167 | 169 | 166 | 197 | 195 | 194 | 200 | 215 | 219 | 219 | 223 | 226 | 226 | 225 | 225 | 225 | 224 | 225 | 226 | 223 | 225 | 227 |
| Arsenic | 90th percentile | 10. | 7.5 | 6.2714 | 5. | 5. | 5. | 5. | 4.5167 | 5. | 5. | 5. | 5. | 3.5498 | 3.1357 | 3.6816 | 2.9533 | 3.2206 | 3.2229 | 2.5739 | 2.3858 | 2.2337 | 2.3031 | 2.0292 | 2.125 | 1.9755 | 1.9833 | 1.8158 | 1.792 | 1.9958 | 1.9375 | 2.0325 | 1.9 | 1.9758 | 1.9008 |
| Arsenic | 50th percentile | 5. | 3. | 2.1 | 2.5 | 2.5 | 2.1537 | 2.0071 | 1.5 | 1.3417 | 1.3875 | 2.5 | 2.5 | 1.7375 | 1.5 | 1.1 | 1.0833 | 0.9225 | 1. | 0.7377 | 0.6967 | 0.64 | 0.6667 | 0.5784 | 0.6642 | 0.6475 | 0.6167 | 0.6833 | 0.6154 | 0.65 | 0.6417 | 0.5617 | 0.5583 | 0.6322 | 0.8 |
| Arsenic | 10th percentile | 1.1818 | 0.75 | 0.5 | 0.25 | 0.5 | 0.5 | 0.4033 | 0.4833 | 0.4375 | 0.55 | 0.7222 | 0.6208 | 0.3896 | 0.34 | 0.5 | 0.55 | 0.5 | 0.5 | 0.5 | 0.4056 | 0.5 | 0.3575 | 0.3809 | 0.5 | 0.5 | 0.5 | 0.5 | 0.4629 | 0.499 | 0.5 | 0.406 | 0.5 | 0.5 | 0.5 |
| Arsenic | No. of sites | 51 | 78 | 111 | 80 | 66 | 70 | 86 | 88 | 89 | 117 | 129 | 126 | 126 | 127 | 135 | 165 | 170 | 179 | 188 | 199 | 198 | 207 | 204 | 211 | 211 | 225 | 225 | 225 | 224 | 225 | 226 | 223 | 225 | 227 |