Synthesis of p-azobenzenediazoaminoazobenzene sulfonic acid and its application for spectrophotometric determination of cadmium

Journal Article · Sat Feb 01 04:00:00 EST 1992 · Analytical Letters; (United States)

DOI:https://doi.org/10.1080/00032719208018530· OSTI ID:5490258

Wanquan, Jiang; Yurui, Zhu ^[1]; Enjiang, Teng; Fusheng, Wei ^[2]

---

1. Univ. of Science and Technology, Hefei (China)
2. China National Environmental Monitoring Center, Beijing (China)

The synthesis and characteristics of a new chromogenic reagent p-azobenzenediazoaminoazobenzene sulfonic acid (ADAAS) is reported. ADAAS forms a dark-violet red complex with cadmium in the presence of Triton X-100 and in ammonia medium. The molar absorptivity of the complex is 2.02 {times} 10{sup 5} 1 mol{sup {minus}1} cm{sup {minus}1} at 532 nm, and the formation constant of the complex is 6 {times} 10{sup 21}. Beer's law is obeyed for cadmium concentrations of between 3.6 {times} 10{sup {minus}8} M and 4.3 {times} 10{sup {minus}6} M. The effect of foreign ion can been eliminated completely by use of masking agents. The proposed method has been used for the determination of trace amounts of cadmium in water samples.

• OSTI ID: 5490258
• Journal Information: Analytical Letters; (United States), Journal Name: Analytical Letters; (United States) Vol. 25:2; ISSN ANALB; ISSN 0003-2719
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540320* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
CADMIUM
ECOLOGICAL CONCENTRATION
ELEMENTS
METALS
POLLUTION
REAGENTS
SPECTROPHOTOMETRY
SPECTROSCOPY
SYNTHESIS
TRACE AMOUNTS
WATER POLLUTION