NEDA

D Netto Longcaps (Neda) lonamin (Torbet) Banobese (Seatrace)... 

Nitrite is determined by diazo-coupling with sulfanilamide and NEDA (see below for full name), forming a reddish color that can be determined with a visible spectrophotometer. 

N-(l-naphthyl) ethylenediamine dihydrochloride (NEDA). Prepare 100 mL of a 0.5% aqueous solution of NEDA. The solution is stable for at least a month if refrigerated and protected from light. It is a poison—use gloves. 

FIGURE 3 Electropherogram of (di)aminopyridine standards. Electrophoretic conditions capillary 67 cm total length (60cm effective length), 50 pm ID BGE 100 mM sodium acetate buffer, pH 5.15 voltage 20 kV detection 240 nm. 4-AP 4-aminopyridine 2-AP 2-aminopyridine 3-AP 3-aminopyridine 3,4-DAP 3,4-diaminopyridine 2,3-DAP 2,3-diaminopyridine 2,6-DAP 2,6-diaminopyridine NEDA N-(l-naphthyl)ethylenediamine (internal standard). (Reprinted from reference 125, with permission.)... 

Many reports on this topic have been published. In the area of cage compounds see, e.g., Kunze C, Selent D, Neda 1, Schmutzler R, Spannenberg A, Borner A (2001) Heteroatom Chem 12 577 and references cited therein... 

Neda I, Kaukorat T, Schmutzler R (1998) Main Group Chem News 6 4... 

Vollbrecht A, Neda I, Thonnessen H, Jones PG, Harris RK, Crowe LA, Schmutzler R (1997) Chem Ber/Recueil 130 1715... 

Yapp, C.J. (1993) Paleoenvironment and the oxygen isotope geochemistry of ironstone of the Upper Ordovician Neda Formation, Wisconsin, USA. Geochim. Cosmochim. Acta 57 2319-2327... 

Table III. Observed Rate Constants for the Appearance of Nitrite ( obs ) and Mo2042+ (kohs) in the Presence of Sulfanilic Acid and NEDA°...

Both the reference and sample cuvettes contained 5.16 X 10"3M sulfanilic acid and 8.3 X 10"4M NEDA. The reaction was initiated by adding nitrate (final concentration = 1.33 X 102M) to the sample cuvette. The average ratio and standard deviation of k0bs /k0bs was 2.08 0.10. 

We are very grateful to Neda Hanc, Milenko Milojevic and Robert Moravec for excellent technical assistance. Two of us (K.L. and H.B.) appreciate continuous financial support by the Ministry of Science and Technology of the Republic of Slovenia M.L. is very indebted to colleagues and coworkers for fruitful discussions. 

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