Spectrophotometric determination of Zn with 4-(2-pyridylazo) resorcinol

Journal Article · Tue Dec 01 04:00:00 EST 1970 · Japan Analyst

OSTI ID:4935126

Kitano, Misugu; Ueda, Joichi

4-(2-pyridylazo) resorcinol (PAR) reacts sharply with zinc to form a water soluble orange-red complex. This complex has constant absorbance at pH 9.2 to 10.6, and its maximum absorbance is at 493 m mu . It has very high sensitivity with a molar absorptivity of 8.3 x 10/sup 4/, and the complex obeys Beer's law up to 0.8 mu g/ml. The composition of the complex is Zn:PAR = 1:2. The effect of 38 coexisting ions was investigated, and it was found that indium, bismuth, copper, mercury(II), cadmium. yttrium, manganese, cobalt, and nickel interfere; however, indium and manganese can be masked by the addition of sodium pyrophosphate, while bismuth and yttrium can be masked with sodium tartarate and sodium fluoride, respectively. It is possible to combine the procedure with an ion exchange separation to determine trace levels of zinc in the presence of large quantities of copper, manganese, cobalt, and nickel. (tr-auth)

• Research Organization: Kanazawa Univ. (Japan)
• NSA Number: NSA-29-009700
• OSTI ID: 4935126
• Report Number(s): ORNL-tr--2749
• Journal Information: Japan Analyst, Journal Name: Japan Analyst Vol. 19; ISSN BNSKA
• Country of Publication: Japan
• Language: English

Related Subjects

COBALT
COPPER
INTERFERING ELEMENTS
MANGANESE
N40120* --Chemistry--Analytical & Separations Chemistry-- Chemical & Spectral Procedures
NICKEL
PH VALUE
PYRIDYLAZORESORCINOL
SPECTROPHOTOMETRY
ZINC