References
- Rippi , B. and Schwer , E.W. 1968 . The determination of nitrate nitrogen in mixed fertilizer using 1,2,4‐phenyldisulfonic acid . Fert. Soc. Proc. London , 104 : 117
- Norwitz , G. and Gordon , H. 1977 . An improved technique for the spetrophotometric determination of nitrate with 2–4‐xylenol . Anal. Chem. Acta , 89 (1) : 177
- Baker , A.S.J. 1967 . Colorimetric determination of nitrate in soil and plant extracts with brucine , 802 A.S.J. Agr. Food Chem. . (Reapproved 1978)
- Roberige , W.P. , Edward , A.E. and Johnson , S. 1983 . Water and wastewater analysis via nitration of salycilic acid commun . Soil Sci. Plant analysis , 14 (12) : 1207 – 1215 .
- Sims , J.R. and Jackson , G.D. 1971 . Rapid analysis of soil nitrate with chromeotropic acid . Soil Sci. Soc. Am. Proc ,
- Nelson , J.L. , Kurtz , L.T. and Bray , R.H. 1954 . Rapid determination of nitrates and nitrites . Anal. Chem. , 26 : 1081 – 2 . Twelfth ed.
- Standard Methods for the examination of water and wastewater A.P.H.A., A.W.W.A., W.P.C.I. 1965 . Nitrate ‐ Diazotation Method (Tentative) . : 395 – 8 .
- Henrikson , A. and Selmer‐Olsen , A.R. 1970 . Automative methods for determining nitrate and nitrite in water and soil extracts , Analyst 95 514
- Aoyama , Mamoru , Toshiguki , H. and Shigetaka , S. 1982 . Application of zinc reduction flotation method for the determination of trace amounts of nitrate in water . Bunseki Kagaku , 31 (4) : E163 – E166 . Ch. Ab. 97/28324K
- Rooma , M. and Kalashnikova , N.S. 1986 . A modified technique for determining nitrates in Food . Gig. Sanit. U.S.S.R. , : 57 – 8 . Ch. Ab. 104,108003 h
- Jiri , Matula . 1989 . Powdered reagent mixture for semiquantative detection of nitrates and nitrites in plants Vol. 111 , 255 776 Czech C S 255,776. Ch. Ab.
- Method and apparatus for detecting nitrite ions in fluids . Israel Patent No. 61951 (1984), U.S.A. Patent No. 4,434,235 .
- Method and reagents for the detection, estimation and quantitative determination of nitrate ions. . 1976 . U.S.A. Patent S N 650851 .