Hydroxyamidines as new extracting reagents for spectrophotometric determination of cadmium with 4-(2-pyridylazo)naphthol in industrial effluents, coal, and fly ash
- Pt. Ravishankar Shukla Univ., Raipur (India)
A simple, sensitive, and selective extractive spectrophotometric method for the determination of cadmium in trace quantities with N1-hydroxy-N1,N2-diphenylbenzamidine (HDPBA) and 4-(2-pyridylazo)naphthol (PAN) is described. The method is based on the extraction of cadmium with HDPBA into chloroform at pH 9.0 +/- 0.2 and simultaneous spectrophotometric determination with PAN. The binary Cd(II)-HDPBA complex extracted into chloroform has a molar absorptivity of 1.96 x 10(4) L/mol/cm at lambda max 400 nm. The sensitivity of the yellow Cd(II)-HDPBA complex was increased remarkably by the addition of PAN to the binary complex. With 6 different hydroxyamidines tested, the red-orange complex in chloroform exhibited maximum absorbance at 530-550 nm, with molar absorptivity values of 3.2-5.6 x 10(4) L/mol/cm. The method adheres to Beer's law up to 1.5 micrograms cadmium/mL organic phase. The detection limit of the method is 0.02 micrograms Cd/mL. Investigations of the effect of foreign ions revealed that the present method is free from matrix interference of most of the common ions (e.g., Fe(III), Ni(II), Cu(II), Mn(II), V(V), Co(II), Al(III), Cu(II), Mg(II), and Mo(VI)). The relative standard deviation for 10 repetitive analyses of the metal was 1.4%. The validity of the method was tested successfully with various environmental samples.
- OSTI ID:
- 6207471
- Journal Information:
- Journal of AOAC International; (United States), Vol. 76:3; ISSN 1060-3271
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AMIDINES
CHEMICAL REACTIONS
CADMIUM
DETECTION
SPECTROPHOTOMETRY
ABSORPTIVITY
CARBON
CHLOROFORM
COAL
EXTRACTION
FLY ASH
INDUSTRIAL WASTES
METALS
NAPHTHOLS
PAN
REAGENTS
SENSITIVITY
TECHNOLOGY ASSESSMENT
WATER POLLUTION
AEROSOL WASTES
AROMATICS
ASHES
AZINES
CARBONACEOUS MATERIALS
CHLORINATED ALIPHATIC HYDROCARBONS
COMBUSTION PRODUCTS
DIAZO COMPOUNDS
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HALOGENATED ALIPHATIC HYDROCARBONS
HETEROCYCLIC COMPOUNDS
HYDROXY COMPOUNDS
MATERIALS
NONMETALS
OPTICAL PROPERTIES
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHENOLS
PHYSICAL PROPERTIES
POLLUTION
PYRIDINES
RESIDUES
SEPARATION PROCESSES
WASTES
540220* - Environment
Terrestrial- Chemicals Monitoring & Transport- (1990-)
400102 - Chemical & Spectral Procedures