Bir Hidroksiazo Bileşiği Kullanılarak Gerçek Örneklerde Nikelin Eser Miktarlarının Spektrofotometrik Tayini

Bu makalede, nikel tayini için, herhangi bir ön deriştirme işlemi uygulamadan, pH 5,5 (5-6) 'da 2,3,4,6/-tetrahidroksi-3/-sülfoazobenzen (THSA) ile şelat oluşturarak seçici ve duyarlı bir spektrofotometrik yöntem önerilmiştir. Metal ligand oranı 1: 1 olan kompleksin, 485 nm'de, molar absorplama katsayısı 1,60 ×104 L mol−1 cm−1 'dir. Kompleks bileşik 3 saat kararlılığını korumaktadır. Ayrıca, 50 °C’ye kadar bozulmadan kalır. Geliştirilen yöntem 0,040-2,348 µg mL−1 Ni (II) tayin aralığında Beer’in kanununa uyar. Toprak alkali elementler, alkalin elementler, nadir toprak elementler, halojenürler, fosfatlar, askorbik asit ve katyonlar nikel tayini engellemez. Önerilen yöntem hızlı ve basittir ve nikel tayini için sertifikalı alaşımlara ve çevre suyu örneklerine kolayca uygulanabilir.

Anahtar Kelimeler:

Nikel, Spektrofotomerik Tayin, 2 3 4 6/-tetrahidroksi-3/-sülfoksiazobenzen, THSA

Spectrophotometric Determination of Trace Amount of Nickel in Real Samples by Using Hydroxyazo Compound

In this article, a selective and sensitive spectrophotometric by chelating with 2,3,4,6/-tetrahydroxy-3/-sulfoazobenzene (THSA) at pH 5.5 (5-6) without applying any preconcentration process for nickel determination method is proposed. A selective and sensitive spectrophotometric method has been proposed for the determination of nickel by forming chelate at pH 5.5 (5-6) with 2,3,4,6/-tetrahydroxy-3/-sulfoazobenzene (THSA). Molar absorptivity of the complex having metal ligand ratio of 1:1 is 1.60 × 104 L mol−1 cm−1 at 485 nm. The complex compound is stable for 3 hours. Furthermore, it is stable up to 50 ° C. The developed method obeys Beer’s law for 0.040-2.348 µg mL−1 Ni(II). Earth alkaline elements, alkaline elements, rare earth elements, halides, phosphates, ascorbic acid and cations do not interfere nickel determination. The proposed method is rapid and simple, and it can be easily applied on certificated alloys and environmental water samples for determining nickel.

Keywords:

Nickel, Spektrophotometric determination, 2.3.4.6/-Tetrahydroxy-3/- sulphoazobenzene, THSA,

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