Short Communication Spectrophotometric Determination of Trace Oxalic Acid with Zirconium(iv)-dibromochloroarsenazo Complex
نویسندگان
چکیده
Based on the property that oxalic acid has the effect on the replacement of dibromochloroarsenazo in zirconium(IV)-dibromochloroarsenazo complex to produce hyperchromic effects in 1.26 M hydrochloric acid medium, a novel method for the determination of trace oxalic acid by spectrophotometry was developed. The concentration of oxalic acid is linearly related to the absorbance at 500 nm. Beer’s law is obeyed over the range of 5.0 x 10 -5 3.0 x 10 -4 M for oxalic acid. The apparent molar absorptivity of the determination of oxalic acid is ε 500 nm = 1.52 × 10 3 M 1 ·cm -1 with a correlation coefficient of 0.9994. The detection limit of the present method is 1.73 mg.L -1 of oxalic acid. The method was used in the determination of trace amounts of oxalic acid in a few of kinds of tea leaves with satisfactory results.
منابع مشابه
Trace determination and separation of tin (II) by floatation-spectrophotometric using kalmagyte and CTAB
ABSTRACTA novel floatation-spectrophotometric extraction method was developed for the recovery of tin (II) from aqueous samples prior to determination by UV spectrophotometric detection. The method is based on the formation of a complex between tin (II) and kalmagyte in pH=8. The complex is floated in the interface of n-hexane and aqueous phases. After removing the aqueous phase, the floated pa...
متن کاملJanus Green Dye as a New Reagent for Catalytic Kinetic Determination of Zirconium in Ceramic Materials
A new catalytic kinetic spectrophotometric procedure for determination of trace quantities of zirconium was proposed. Janus Green was oxidized by potassium bromate and zirconium catalyst which then converted to a colorless product in acidic media. Reaction rate was monitored spectrophotometrically at 606 nm. It relies on the linear relationship between the absorbance difference (ΔAt) and Zr(IV)...
متن کاملRapid direct spectrophotometric determination of zirconium(IV) in alloys with 2,2/,3,4-tetrahydroxy-3/-sulpho-5/-carboxyazobenzene reagent
In this study, 2, 2', 3, 4-tetrahydroxy-3'-sulpho-5'-carboxyazobenzene (tetrahydroxyazon SC) has been synthesized for the first time and used for direct spectrophotometric determination of zirconium(IV). Tetrahydroxyazon SC in a 5.0 M acidic medium (up to pH 6) with zirconium(IV) gave a red complex (Zr-tetrahydroxyazon SC), which has maximum absorption at 495 nm (molar absorptivity, 4.9x104 l m...
متن کاملSulfonephthalein dyes. П.* Protolytic equilibria of methylxylenol blue
Methylxylenol blue or S^'-bis-Z^jiV'-diicarboxymethylJaminomethyl-^-xylenolsulfonephthalein belongs to the group of metallochromic indicators prepared by Körbt and Přibil [1] via condensation of common sulfonephthalein dyes with formaldehyde and iminodiacetic acid. Recently it has been newly prepared by Cherkesov and co-workers [2] and named ^-xylenolphthalexon S. Two indicators from this group...
متن کاملDetermination of ultra trace amount manganese (II) in water samples with the 1-(2-PyridylAzo)-2-Naphthol, (PAN) by the bromate ion in sulfuric acid with kinetic spectrophotometric method
A new kinetic spectrophotometic method for the determination of trace amount manganese(II) in Tea real samples has been described based on it s the catalytic effect on the oxidations of 1 - (2 – Pyridyl Azo) - 2 - Naphthol, (PAN), by potassium bromated in sulfuric acid. The reaction is followed spectrophotometrically by measuring the decrease in the absorbance at 547.5 nm. Under the optimum con...
متن کامل