Determination of chlorine in concentrated sulfuric acid solution with a residual chlorine electrode

1979 ◽  
Vol 51 (8) ◽  
pp. 1332-1333 ◽  
Author(s):  
Kenny D. Brown ◽  
Gordon A. Parker
Keyword(s):  
Sulfuric Acid ◽  
Acid Solution ◽  
Sulfuric Acid Solution ◽  
Residual Chlorine ◽  
Concentrated Sulfuric Acid

scholarly journals Evaluation of Corrosion Resistant of Amorphous Fe-Ni-Cr-Ta Alloys in Hot Concentrated Sulfuric Acid Solution

2000 ◽  
Vol 64 (5) ◽  
pp. 367-370
Author(s):  
Hideyuki Ogishi ◽  
Takeshi Suemitsu ◽  
Akira Takashima ◽  
Hyoe Ono ◽  
Hidemi Ukai ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Acid Solution ◽  
Sulfuric Acid Solution ◽  
Corrosion Resistant ◽  
Concentrated Sulfuric Acid

Separation and Determination of Trace Amounts of Tin Present as Organotin Residues on Fruits

1970 ◽  
Vol 53 (1) ◽  
pp. 140-146
Author(s):  
Homer B Corbin
Keyword(s):  
Sulfuric Acid ◽  
Acid Solution ◽  
Sulfuric Acid Solution ◽  
Extraction Method ◽  
Colorimetric Method ◽  
Separation Method ◽  
Measuring System ◽  
Accuracy And Precision ◽  
Spray Treatment

Abstract The dithiol colorimetric method has been applied to the determination of trace amounts of tin as residues from the spray treatment of fruit with a miticide containing tricyclohexyltin hydroxide. The samples are prepared by an initial wet combustion to give a sulfuric acid solution of tin in the inorganic form. The tin is separated from other elements in the acid digest by one of two methods. One involves distillation of stannic bromide with a mixture of HBr and HCl. In the second separation method stannic iodide is extracted into n-hexane. Both separation procedures result in a solution of tin in a few milliliters of concentrated H2SO4, which is then measured spectrophotometrically. Data are presented for sensitivity and precision of the measuring system; accuracy and precision of both separation methods are illustrated by duplicate analyses and recovery tests on apples and pears treated with various cyclohexyltin compounds and inorganic tin. The extraction method has been tested for compatibility with 35 elements. Only arsenic (>0.15 mg or 1.5 ppm) and antimony (>2 mg or 20 ppm) are likely to interfere. Procedures are given for elimination of greater amounts of these elements.

Electrically Conductive Composite of Polyaniline and Poly(p-Phenylene-Terephthalamide)

1989 ◽  
Vol 173 ◽  
Author(s):  
Xian-Tong Bi ◽  
C. Wang ◽  
J. S. Bao
Keyword(s):  
Sulfuric Acid ◽  
Acid Solution ◽  
Sulfuric Acid Solution ◽  
Liquid Crystalline ◽  
Conductive Polymer ◽  
Electrically Conductive ◽  
Electrical Conductivities ◽  
Concentrated Sulfuric Acid ◽  
Electrically Conductive Composite ◽  
Poly Aniline

ABSTRACTThe improvement of the processibility and mechanical properties of poly-aniline (PAn) by processing a concentrated sulfuric acid solution of the mixture of chemically prepared conductive PAn powders and poly(p-phenylene-terephthalamide) (PPTA) in different weight ratios are presented.The concentrated sulfuric acid solution of PAn and PPTA were processed to films and threads, they are liquid crystalline conductive polymer composites, the electrical conductivities of the composites are between 10−4 -10−1 s/cm.PAn enhanced the tensile strength of PPTA, but does not effect the elongation. The morphology of the PPTA/PAn composite surfaces are fiberlike texture.

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