Extractive-spectrophotometric determination of vanadium(IV/V) in catalysts using 4-(2-pyridylazo)-resorcinol and tetrazolium violet
Küçük Resim Yok
Tarih
2006
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Polskie Towarzystwo Chemiczne-Polish Chemical Society
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
An extractive-spectrophotometric method for determination of V(V) and V(IV) has been developed. V(V) was converted to ternary ion-associate complex with 4-(2-pyridylazo)resorcinol and tetrazolium violet. In the presence of diaminocyclohexanetetraacetic acid and NH4F as the masking agents determination of V(V) was highly selective, and V(IV) was among the masked ions. Due to this fact V(IV) could be determined indirectly from the difference in the absorbance measured in the presence and absence of the oxidizing agent, which oxidised V(IV) to V(V). The factors influencing determination of V(V) in the presence of large excess of V(IV) have been investigated. The method was applied to the determination of V(IV/V) in catalysts used for oxidation of SO2 to SO3. The precision and accuracy were satisfactory (R.S.D <= 1.9%). Detection limit of V(V) was 3.3 ng mL(-1). Beer's law was obeyed up to V(V) concentration of 1.45 mu g mL(-1) in dichloroethane extract. The corresponding molar absorptivity coefficient was 3.05 x 10(4) L mol(-1) cm(-1).
Açıklama
Anahtar Kelimeler
Vanadium(IV/V), Speciation Analysis, 4-(2-Pyridylazo)-Resorcinol, Tetrazol Violet, Extract Ion-Spectrophotometry, Catalysts, Atomic-Absorption Spectrometry, Quantitative-Determination, Samples
Kaynak
Chemia Analityczna
WoS Q Değeri
Q4
Scopus Q Değeri
N/A
Cilt
51
Sayı
2
