Sedimentation Volume of Sparingly Soluble Salts. V-VI. V. The Effects of Common Ions on the Sedimentation Volume of Barium Sulfate, Barium Chromate, Lead Sulfate and Lead Chromate

Abstract The 1.0 to 2.5 per cent of sulfur normally present in rubber products is oxidized with concentrated nitric acid-bromine reagent, followed by perchloric acid in the presence of excess lead nitrate. Sulfur as lead sulfate is precipitated and washed with acetone. The lead sulfate is dissolved in 50 per cent hydrochloric acid, and absorbance of the lead chloride complex is recorded at 270 mµ. Sulfur is calculated on the basis of the measured lead content of the precipitate. The high sensitivity puts the method in the micro-range. An experienced analyst can analyze 40 to 50 samples a day. Precision and accuracy are comparable to those of the conventional barium sulfate gravimetric method at the low sulfur concentrations normally found in rubber products.

Download Full-text

Lead chromate versus Barium Chromate. Dem. 634

Journal of Chemical Education ◽

10.1021/ed046pa452.3 ◽

1969 ◽

Vol 46 (6) ◽

pp. A452

Author(s):

Hubert N. Alyea

Keyword(s):

Lead Chromate ◽

Barium Chromate

Download Full-text

Comparison of two particulate hexavalent chromium compounds: Barium chromate is more genotoxic than lead chromate in human lung cells

Environmental and Molecular Mutagenesis ◽

10.1002/em.20044 ◽

2004 ◽

Vol 44 (2) ◽

pp. 156-162 ◽

Cited By ~ 15

Author(s):

Sandra S. Wise ◽

Julie H.C. Schuler ◽

Amie L. Holmes ◽

Spiros P. Katsifis ◽

Michael E. Ketterer ◽

...

Keyword(s):

Hexavalent Chromium ◽

Human Lung ◽

Lung Cells ◽

Lead Chromate ◽

Human Lung Cells ◽

Barium Chromate ◽

Chromium Compounds

Download Full-text

Thermal Stability of Inorganic Pigments Synthesized from Galvanic Sludge

Revista de Chimie ◽

10.37358/rc.20.8.8274 ◽

2020 ◽

Vol 71 (8) ◽

pp. 13-20

Author(s):

Maria-Iuliana Marcus ◽

Maria Vlad ◽

Gyorgy Deak ◽

Andreea Moncea ◽

Ana-Maria Panait ◽

...

Keyword(s):

Thermal Treatment ◽

Microstructural Characterization ◽

Orthorhombic Phase ◽

Advanced Degree ◽

Lead Chromate ◽

Weight Losses ◽

Galvanic Sludge ◽

Barium Chromate ◽

Thermal Stability Of ◽

Complex Thermal Analysis

Pigments used in ceramic glazes have been obtained by chromium ions extraction from galvanic sludge and their precipitation as barium chromate and lead chromate from technological solutions. The chemical composition was determined by XRF method. Complex thermal analysis TG-DSC, XRD and SEM methods have been used for microstructural characterization and thermal treatment behaviour evaluation, in order to establish the compatibility with the ceramic matrix. XRD spectra have highlighted only lead chromate specific interferences in the monoclinic phase and barium chromate in the orthorhombic phase, suggesting an advanced degree of purity. Weight losses of 2.2% for barium chromate and 3.1% for lead chromate have been recorded on the TG curve at 800�C. As a result of thermal treatment, barium chromate has changed its colour from yellow to green.

Download Full-text