Extraction-spectrophotometric determination of hydrazine with 2-hydroxy-1-naphthaldehyde

Abstract

An extractionspectrophotometric method for the determination of hydrazine, based on its reaction with 2-hydroxy-I-naphthaldehyde at 100 "C, is described. Beer's law is obeyed between 35 and 700 ng ml-1 of hydrazine. The molar absorptivity at 41 2 nm is 27 000 I mol-1 cm-1. The method described has been applied satisfactorily to the determination of hydrazine in feed waters for steam-generating boilers.

Spectrophotometric and fluorometric methods for the determination of hydrazine and its methylated analogues

“…It has been shown that the derivative of hydrazine with 2 hydroxy 1 naphthaldehyde has fluorescence providing the opportunity of reducing the limit of hydrazine quantification in blood as compared to a similar procedure with spectrophotometric detection from 160 to 30 µg/mL [83]. The same authors adjusted the procedure involving 2 hydroxy 1 naphtaldehyde for fluorometric determination of hydrazine in phar maceutical preparation based on hydrazides [115].…”

“…Extraction photometric determina tion of hydrazine usually involves more hydrophobic components then p DMAB, for example, 2 hydroxy 1 naphthaldehyde [37,83]. The resultant hydropho bic azine is extracted from 10 mL of the reaction mix ture with 5 mL of chloroform.…”

Sequential determination of free acidity and hydrazine in presence of hydrolysable ions

“…Quantitative determination of hydrazine is based on its property either as a weak base or as a reducing agent. Several methods have been described in the literature for the determination of hydrazine using different analytical techniques such as voltametry [9,10], coulometry [11,12], amperometry [13], ion selective electrode [14,15], gas chromatography [16,17], ion chromatography [18], spectrophotometry [19][20][21][22][23], spectrofluorimetry [24][25][26], titrimetry [27,28], potentiometry [29][30][31][32] and indirect methods [33]. Bray and Cuy estimated hydrazine by adding excess sodium hypochlorite to a buffer solution of hydrazine sulfate [29].…”

Indirect Spectrophotometric Determination of Trace Quantities of Hydrazine

“…22 However, most of the proposed methods either lack sufficient sensitivity, 16 require complicated and expensive instruments, 17 are time consuming, 3 or provide high detection limits. 10,12 Therefore, the need for a sensitive, simple and reliable method for the determination of hydrazine is well recognized.…”

“…Several methods are described in the literature for the determination of hydrazine, using different analytical techniques, such as spectrophotometry, [3][4][5][6][7][8][9] 20,21 and indirect methods. 22 However, most of the proposed methods either lack sufficient sensitivity, 16 require complicated and expensive instruments, 17 are time consuming, 3 or provide high detection limits.…”