Development of spectrophotometric determination method for Au(III) and Ag(I)

Abstract

In this research, a potentiometric and spectrophotometric method

was developed to determine Ag(I) and Au(III) based on their

reaction with m and p-phenylenediamine. As a result reactions

between Ag(I) and Au(III) and m- and p-phenylenediamine

mixtures was revealed that, there is an oxidation by means of

complexation via oxidation, a diazo compound occured from

amines and Ag(I) was reducted to elementel form, Au(III) was

reducted to Au(I). Also the formation conditions of the reactions

of these metals with amines were investigated, the pH range that

the reactions took place, time needed for the formation of the

reactions and the mol ratios needed for the complete reaction of

the metals with amines. Mole ratios were determined as follows:

Ag(I) / (m+p)phenylenediamine= 1;

Au(III) / (m+p)phenylenediamine= 1/2

Keywords

• Spectrophotometer,potentiometer,m- ve pphenylenediamine,Ag(I) and Au(III)

Au(III) için Ag(I) kullanılarak spektrofotometrik bir tayin yönteminin geliştirilmesi

Abstract

Bu araştırmada m- ve p-fenilendiaminlerin tedavi amaçlı

olarak da kullanılan Ag(I) ve Au(III) ile verdiği tepkimeler

spektrofotometrik ve potansiyometrik yöntemler kullanılarak

bir tayin yönteminin geliştirilmesi amaçlanmıştır. m- ve

p-fenilendiamin karışımlarıyla Ag ve Au(III)’ün verdiği

reaksiyonlar sonucunda kompleksleşme üzerinden yürüyen

bir oksidasyon olduğu, bu oksidasyona bağlı olarak aminler

arasında bir diazo bileşiği oluşurken Ag(I)’in elementel hale

Au(III) ün ise Au(I) basamağına indirgendiği görülmüştür.

Ayrıca Ag(I) ile aminlerin verdiği reaksiyonların oluşum

koşulları incelenerek, reaksiyonun meydana geldiği pH aralığı,

reaksiyonların oluşum süreleri ve bu metallerle aminlerin tam

olarak reaksiyona girebilmesi için gerekli olan mol oranları

bulunmuştur. Deney sonuçlarına göre Ag(I) ve Au(III)’ün

aminlerle oluşturdukları oksidatif bağlanma ürünlerinin mol

oranları belirlenmiştir.

Ag(I)/(m+p)fenilendiamin=1 ;

Au(III)/ (m+p)fenilendiamin= 1/2

Anahtar kelimeler: Spektrofotometre,

Keywords

• Spektrofotometre,potansiyometre,m- ve p-fenilendiamin,Ag(I),Au(III)

References

1. 1. Kirk-Othmer Encylopedia of Chemical Technology. IntersincPublished, Newyork. 1966, pp. 10:378, 380-384, 687.
2. 2. Pourreza N, Rastegarzadeh S. Simultaneous Determinationof gold and palladium with 5-(p-dimethylaminobenzylidene)rhodanine by using the H-point standard addition method inmicellar media. Anal Chim Acta 2001; 437: 273-80.
3. 3. Zuotao Z, Qiheng X. Colour reaction of gold with 5-(4-sodiumsulphonatephenylazo)-8-aminoquinoline and its analyticalapplication. Talanta 1992; 39: 409-13.
4. 4. Das M, Patel KS, Mishra RK. Extraction of gold(III) withvarious amidines: Spectrophotometric determination of goldin low grade ores. Analysis 1989; 17:540-2.
5. 5. Moustafa ME, Mabrouk HA, Dessouki HA, Amine SA.Spectrophotometric Microdetermination of copper(II),silver(I), and gold(III) using azastyrene schiff bases.Microchem J 1991; 44: 311-7.
6. 6. Gowda HS, Ramappa PG. Spectrophotometric determinationof traces of gold with N-substituted phenothiazines. FreseniusZ Anal Chem 1976;280: 221-7.
7. 7. Robertus R L Levin V. Spectrophotometric determination ofsilver(I) in nonaqueous solutions by oxidative coupling ofaromatic amines. Anal Chem 1968;40:2053-4.
8. 8. Vogel AI. Quantitative Inorganic Analysis, 2nd edn. Longmans,London.1951.

9. 9. Bailar JC, Emeléus HJ, Trotman-Dickenson AF. ComprehensiveInorganic Chemistry. Newyork-Pergamon, 1975.
10. 10. Mori I, Tominaga H, Fujita Y, Matsuo T. New And sensitivespectrophotometric determination of gold(III) with N,Ndimethyl-p-phenylenediamine and potassium persulfate.Anal Lett 1997; 30: 953-61.
11. 11. Fujita Y, Mori I, Matsuo T. Spectrophotometric determinationof gold(III) by an association complex formation betweengold-thiamine and phloxine. Anal Sci 1999; 15:1009-12.
12. 12. Başer İ, İnanıcı Y. Boyarmadde Kimyası. Marmara UniversitesiYayınları. İstanbul. 1990; pp. 482:24-25, 53-54.
13. 13. Bent RL, Dessloch JC, Duennbier FC, Fassett DW, GlassDB, James TH, Julian DB, Ruby WR, Snell JM, Sterner JH,Thirtle JR, Vittum PW, Weissberger A. Chemical constitution,electrochemical, photographic and allergenic properties ofp-amino-N-dialkyl-anilines. J Am Chem Soc 1951; 73:3100-25.
14. 14. Dembinski D, Kurzawa M, Czerniak SA. Spectrophotometricmethod of the determination of gold (III) by using imipraminehydrochloride and promethazine hydrochloride. Pak J Sci IndRes 2003;46:230-4.