Detail of "135-52-4"

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CAS Number:
135-52-4
Name:
Benzoic acid,2-[2-[[2-(2-hydroxy-5-sulfophenyl)diazenyl]phenylmethylene]hydrazinyl]-
Molecular Structure:
Formula:
C20H16 N4 O6 S
Molecular Weight:
440.43
Synonyms:
Benzoicacid, 2-[1-(2-hydroxy-5-sulfophenyl)-3-phenyl-5-formazano]-; Benzoic acid,2-[[[(2-hydroxy-5-sulfophenyl)azo]phenylmethylene]hydrazino]- (9CI); Benzoicacid, o-[1-(2-hydroxy-5-sulfophenyl)-3-phenyl-5-formazano]- (8CI); Benzoicacid, o-[[a-[(2-hydroxy-5-sulfophenyl)azo]benzylidene]hydrazino]-(6CI,7CI); Zincon; Zincone
Density:
1.48g/cm³
Melting Point:
203°C (dec.)
Boiling Point:
°Cat760mmHg
Flash Point:
°C
Solubility:
moderate
Appearance:
purple powder
Hazard Symbols:
Risk Codes:
36/37/38
Safety:
Hazard Codes Xi
Risk Statements 36/37/38
Safety Statements 26-36/37/39-36
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Photometric method for determining zinc in wines: Photometric method for determining zinc in wines. Ivanov, K.; Maneva, D. (Bulg.). Khranit. Prom-st., 26(3), 23-6 (Bulgarian) 1977. CODEN: KPRSAG. DOCUMENT TYPE: Journal CA Section: 16 (Fermentations) Section cross-reference(s): 79 In the title method, zincon [135-52-4] forms a blue-colored complex with Zn in a weakly alk. medium. Interfering metals (Al, Cu, Fe, Ca, and Mn) are sepd. from Zn using a Dowex 1 .times. 8 ion-exchange column from which Zn is eluted with 2N HCl and N KCl into a 0.1N NaNO3 soln. Zincon (0.05% soln.) in pH 9.2 buffer is added and the absorbance is measured at 620 nm. The relative std. error was 3.52-9.41%, depending on wine type. The method is less laborious, faster, and more accurate than currently used methods.

Contribution to the determination of zinc in water: Contribution to the determination of zinc in water. Stankova, Oldriska; Zajoncova, Ludmila (Fac. Nat. Sci., Palacky Univ., Olomouc 77146, Czech.). Acta Univ. Palacki. Olomuc., Fac. Rerum Nat., 79(Chem. 23), 165-75 (English) 1984. CODEN: AUONAD. ISSN: 0472-9005. DOCUMENT TYPE: Journal CA Section: 61 (Water) Section cross-reference(s): 79 The detn. of small amts. of Zn in water and wastewater by spectrophotometry using zincon (I) [135-52-4] is not specific and is interfereds with by the presence of some components in the reaction mixts. The interfering components include substances which form ppts. with KCN, B- buffer, or I (Hg, Be, Bi); substances that decrease the absorbance of the Zn2+-I complex (Al, Cr(III), Fe(III), Mn(II), MnO4-); and substances that form complexes with I and increase the absorbance of the Zn2+-I complex (Cd, Co, Cu, Ni, Pb, HCOH [50-00-0], CH3COH [75-07-0]). The interferences of these compds. can be eliminated by using preconcn. by extn. or ion exchangers.