References
- Henriksen , A. and Selmer-Olsen , A. R. 1970 . Analyst , 90 : 514 – 518 .
- Nakata , R. , Terashita , M. , Nitta , A. and Ishikawa , K. 1990 . Analyst , 115 : 425 – 430 .
- Ebdon , L. , Braven , J. and Frampton , N. C. 1990 . Analyst , 116 : 1005 – 1010 .
- Alonsochamarro , J. , Bartroli , J. , Jun , S. , Lima , J. L. F. C. , Conceicao , M. and Montenegro , B. S. M. 1993 . Analyst , 118 : 1527 – 1532 .
- Sah , R. N. 1994 . Soil Sci. Plant Anal , 25 : 2841 – 2869 .
- Rennie , P. J. , Sumner , A. M. and Basketter , F. B. 1979 . Analyst , 104 : 837 – 845 .
- Greenberg , A. E. , Clesceri , L. S. and Eaton , A. D. 1992 . Standard Methods for the Examination of Water and wastewater , Washington : American Public Health Association . (Eds),(.
- Anderson , H. A. and Russell , J. D. 1976 . Nature , 260 : 597
- Meybeck , M. 1982 . Am. J. Sci , 282 : 401 – 450 .
- Dong , H. , Jiang , M. and Zhang , Q. 1991 . Anal. Letters , 24 : 305 – 315 .
- Sempere , A. , Oliver , J. and Ramos , C. 1993 . J. Soil Sci , 44 : 633 – 639 .
- Chapman , P. J. , Reynolds , B. , Cresser , M. S. and Neal , C. Hydrology, Water Resources and Ecology in Headwaters 443 – 450 . (IAHS Publication No. 248, 1998), pp.
- Edwards , A. C. and Cresser , M. S. 1987 . Water Res , 21 : 49 – 56 .
- Reynolds , B. and Edwards , A. C. 1995 . Agric. Water Manage , 27 : 181 – 202 .