Extraction of Metal Pyridine Azides.  Spectrophotometric Determination of Copper, Nickel, and Palladium.

Clem, Ray G.; Huffman, E. H.

doi:10.1021/ac60239a037

Cited by 7 publications

(8 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the present study, the applicability of the paramagnetic character of the complex of N 3 with Cu 2+ to the determination of N 3 has been studied since only paramagnetic species could be sensitively detected by EPR method even for crude materials [6]. In benzene solution, the quantitation of the complex of N 3 with Cu 2+ means the quantitation of N 3 -, since the present study showed that one Cu 2+ ion combined with two N 3 ions always in benzene, whereas one Cu 2+ ion combined with either one, two or four N 3 ions in water [2,3].…”

Section: Introductionmentioning

confidence: 96%

“…When poisoning occurred, quick and decisive determination of toxic substances is required using the sample as small as possible. Demonstration of the presence of azide ion (N 3 -) was mostly based on a color reaction [1][2][3]. A colorimetric determination of N 3 in blood, beverages and waste-water, however, required large amounts of N 3 -, e.g., 4 -20 μg.…”

Section: Introductionmentioning

confidence: 99%

“…A colorimetric determination of N 3 in blood, beverages and waste-water, however, required large amounts of N 3 -, e.g., 4 -20 μg. Also the measuring processes such as vaporization of N 3 as HN 3 gas and condensation of HN 3 in alkaline solution to avoid interferences from the other substances resulted in 1 hr-measurement time.…”

Section: Introductionmentioning

confidence: 99%

“…Those methods, however, took time for the derivatization of N 3 after the deproteinization of samples. N 3 is known to form immediately ternary complexes with transition metals in the presence of pyridine (Py), and the complexes can be extracted with chloroform [3].…”

Section: Introductionmentioning

confidence: 99%

“…These azide complexes were used for the colorimetric determination of either N 3 or transition metals [1][2][3]; however, the molar absorption of azide complex with Cu in chloroform, ε 435 = 2500, was not large and less than twice that in aqueous solution, ε 385 = 1600 [2,3]. The extraction of the complex with organic solvents reduced the interference by impurities to some extent.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Determination of azide in biological fluids by use of electron paramagnetic resonance

Minakata

Сузукі

2005

Analytica Chimica Acta

View full text Add to dashboard Cite

A simple and sensitive method has been developed for the determination of azide ion (N 3 -) in biological fluids and beverages. The procedure was based on the formation of a ternary complex Cu(N 3 ) 2 (4-methylpyridine) x in benzene, followed by its detection by electron paramagnetic resonance. The complex in benzene showed a characteristic four-peak hyperfine structure with a g-value of 2.115 at room temperature.Cu 2+ reacted with N 3 most strongly among common metals found in biological fluids.Several anions and metal ions in biological fluids did not interfere with the determination of N 3 in the presence of large amounts of Cu 2+ and oxidants. In the present method, N 3 at the concentration from 5 μM to 2 mM in 100 μl solution could be determined with the detection limit of 20 ng. The recoveries were more than 95 % for N 3 added to 100 μl of blood, urine, milk and beverages at 200 μM. Our method is recommendable because it takes less than 10 min to determine N 3 and the produced complex is quite stable.*Corresponding author. Tel/

show abstract

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%