Photometric Determination Of Nickel Research Articles

Stepwise injection photometric determination of nickel in air aerosols

A procedure is developed for the automated determination of nickel in air aerosols; it involves the adhesive separation of aerosols on a fiberglass column in the on-site mode followed by the photometric determination of analytes with dimethyl glyoxime under the conditions of stepwise injection analysis of aerosol concentrates. The analytical range for nickel is 1.5–38 μg/m3; the detection limit of the method is 0.5 μg/m3 at an air sample volume of 30 L. The duration of sampling to an adhesive column and concentrate analysis were 15 and 10 min, respectively.

Pyrogallol azo derivatives as analytical reagents for determining nickel(II)

Reagents based on bis-(2,3,4-trihydroxyphenylazo)benzidine and 2,2′,3,4-tetrahydroxy-3′-sulfo-5′-nitroazobenzene were used for the spectrophotometric determination of nickel. The optimum complexation conditions were found and the stability constants of the nickel complexes were determined. The effect of foreign ions and masking substances on the complexation was studied. The procedure was used for the photometric determination of nickel in volcanogenic rocks.

Selective photometric determination of nickel with photochemically generated anti-2-furaldehyde 2-pyridylhydrazone

Selective Photometric Determination of Nickel with Photochemically Generated Anti-2-Furaldehyde 2-Pyridylhydrazone

Photometric determination of nickel by means of photochemically generated (Z)-2-thiophenaldehyde 2-pyridylhydrazone

The photochemical isomerisation of 2-thiophenaldehyde 2-pyridylhydrazone (TAPH) in ethanolic solution was investigated and the E/Z ratio in the photostationary state was determined. (E)-TAPH scarcely reacted or did not react with metal ions whereas, after irradiation, (Z)-TAPH gave sensitive reactions with several metal ions. A photometric method was developed for the determination of nickel (0.017–0.9 µg ml–1) in aqueous ethanolic medium (50%V/V) at pH 10.7 with a detection limit of 0.005 µg ml–1 and a relative standard deviation of 1.03%. By considering the E/Z ratio in the photostationary state, the corrected stoicheiometry of the chelate was found to be 3:1 (ligand to metal). Applications of the method to the determination of nickel in special steels and environmental fume samples are described.

Photometric determination of nickel in iron and steel, and in pure iron.

A simple and accurate photometric method for the determination of 0.002 about 4% of nickel in iron and steel, and in pure iron with dimethylglyoxime has been established. The sample (0.20.5g) is decomposed by 510ml of perchloric acid, and it is evaporated to vigorous fumes of perchloric acid. After beeing cooled, 1025ml of ammonium citrate solution (25%) acid 10ml of dimethylglyoxime solution (0.5%) are added and mix. The interfering elements are removed by extraction with carbon tetrachloride and back extraction of nickel with 0.9N perchloric acid. The aqueous layer is boiled to expel carbon tetrachloride off, and the separated nickel is colored as nickel (III)-dimethylglyoxime complex by an oxidizing agent such as iodine. The absorbance is measured at 530 mμ or 440mμ (for smaller amount of nickel) against water. The time required for an analysis is about 25min.

Photometric determination of nickel in copper-nickel alloys

Nickel in copper-nickel alloys is determined as nitrate by precision photometry using a wavelength of 390 mμ. Nitrites, pernmanganate and insoluble particles such as metastannie acid and silica will interfere but these are readily removed. Chlorides, However. must be absent. A single determination can be Completed within 5 min.

Photometric Determination of Nickel in Petroleum Cracking Catalyst

Photometric Determination of Nickel in Petroleum Cracking Catalyst

Notes on the extraction of nickeldimethylglyoxime by chloroform and on the photometric determination of nickel by the glyoxime method

AbstractThe extraction of nickeldimethylglyoxime by chloroform has been investigated as a function of pH. In pure nickel solutions extraction is complete in the pH range 4.7‐10; in tartrate solutions in the range 4.8‐12 and in citrate solutions in the range 7.2‐12. Interferences by copper and cobalt are discussed.For the photometric determination of the extracted nickel as the oxidized nickeldimethylglyoxime complex an improved procedure has been developed resulting in a colour system of great stability.