Determination of the critical concentration of partially hydrolyzed polyacrylamide by potentiometry in an acidic medium

2012 ◽  
pp. n/a-n/a ◽  
Author(s):  
Marcos P. S. Gomes ◽  
Marta Costa
Keyword(s):  
Acidic Medium ◽  
Critical Concentration ◽  
Partially Hydrolyzed Polyacrylamide ◽  
Hydrolyzed Polyacrylamide

Determination of nonionic and partially hydrolyzed polyacrylamide molecular weight distributions using hydrodynamic chromatography

1986 ◽  
Vol 58 (11) ◽  
pp. 2242-2247 ◽  
Author(s):  
Martin A. Langhorst ◽  
Fredrick W. Stanley ◽  
Sergio S. Cutie ◽  
Jeffrey H. Sugarman ◽  
Larry R. Wilson ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Hydrodynamic Chromatography ◽  
Partially Hydrolyzed Polyacrylamide ◽  
Molecular Weight Distributions ◽  
Weight Distributions ◽  
Hydrolyzed Polyacrylamide

Determination of partially hydrolyzed polyacrylamide in wastewater produced from polymer flooding by colloid titration

2013 ◽  
Vol 33 (4) ◽  
pp. 345-350
Author(s):  
Shenwen Fang ◽  
Ming Duan ◽  
Yini Xia ◽  
Hu Wang ◽  
Linyu Li
Keyword(s):  
Food Service ◽  
Polymer Flooding ◽  
Service Industries ◽  
Paper Making ◽  
Partially Hydrolyzed Polyacrylamide ◽  
Hydrolysis Degree ◽  
Colloid Titration ◽  
Materials Used ◽  
Hydrolyzed Polyacrylamide

Abstract Colloid titration has been widely used to determine the charge carried by macromolecules and the concentration of anionic and cationic polyelectrolytes in paper making and food service industries. This method is simple and the materials used are non-volatile and harmless, but it has not previously been used to determine the partially hydrolyzed polyacrylamide (HPAM) in wastewater produced from polymer flooding. In this paper, colloid titration was used to determine the HPAM in wastewater produced from polymer flooding in an oilfield. When the HPAM concentration (Cp) was <200 mg/l, the relationship between the Cp and the titration value (Vp) was linear. This linear relationship was influenced by the pH of wastewater and the hydrolysis degree of HPAM; Vp increased with the pH and the hydrolysis degree. However, it was independent of the concentration of solubilized crude oil and salt concentration in the wastewater and the molecular weight of the HPAM. Recovery tests showed that the determination of HPAM in the wastewater by colloid titration was reliable. It was also found that the colloid titration and starch iodide method had similar accuracies for determination of the HPAM and that colloid titration was a better method for the analyst.

Determination of Unconjugated and Total N-Acetyl-p-aminophenol (NAPA) in Urine and Serum

1967 ◽  
Vol 13 (3) ◽  
pp. 215-219 ◽  
Author(s):  
Karel P M Heirwegh ◽  
Johan Fevery
Keyword(s):  
Liver Disease ◽  
Acid Hydrolysis ◽  
Azo Dye ◽  
Acidic Medium ◽  
Diazonium Salt ◽  
Accurate Method ◽  
Total N ◽  
Hydrolysis Of ◽  
Urine And Serum

Abstract A sensitive and accurate method is described for the determination of N-acetyl-p-aminophenol (NAPA) and its metabolites in urine and serum. In strongly acidic medium, p-aminophenol (PAP) resulting from differential extraction and acid hydrolysis of total NAPA and unconjugated NAPA, is diazotized and the diazonium salt coupled with N-(1-naphthyl)ethylenediamine (NED) in the presence of ethanol. The blue azo dye formed is determined spectrophotometrically. Application to liver disease is briefly reported.

A new injectable biphasic hydrogel based on partially hydrolyzed polyacrylamide and nanohydroxyapatite as scaffold for osteochondral regeneration

RSC Advances ◽  
2015 ◽  
Vol 5 (12) ◽  
pp. 9089-9096 ◽  
Author(s):  
Newsha Koushki ◽  
Ali Asghar Katbab ◽  
Hossein Tavassoli ◽  
Azadeh Jahanbakhsh ◽  
Mohammad Majidi ◽  
...  
Keyword(s):  
Partially Hydrolyzed Polyacrylamide ◽  
Osteochondral Repair ◽  
Nanocrystalline Hydroxyapatite ◽  
Hydrolyzed Polyacrylamide ◽  
Osteochondral Regeneration ◽  
Novel Scaffold ◽  
Chromium Acetate

Fabrication of an injectable biphasic hydrogel based on partially hydrolyzed polyacrylamide (HPAM), nanocrystalline hydroxyapatite (nHAp), and chromium acetate (Cr(iii)) as a novel scaffold for osteochondral repair has been attempted.

scholarly journals Rapid Spectrophotometric Determination of Phenoxazine

2010 ◽  
Vol 7 (2) ◽  
pp. 1001-1005
Author(s):  
Baghdad Science Journal
Keyword(s):  
Detection Limit ◽  
Spectrophotometric Determination ◽  
Acidic Medium ◽  
Absorption Maximum ◽  
Aqueous Samples ◽  
Economic Method ◽  
Beer's Law ◽  
Beer’S Law ◽  
The Stability

A rapid high sensitive and inexpensive economic method has been developed for the Determination of phenoxazine by using molecular spectrophotometry. The method is based on the oxidation of phenoxazine by potassium (meta)periodate in acidic medium. The oxidation conditions were selected to enhance the sensitivity and the stability of the pink colored species which shows an absorption maximum at 530 nm. The Beer’s law was obeyed for phenoxazine concentration range from 1 to 6 µg mL-1 with 0.003 µg mL-1 detection limit and provided variation coefficients between 0.4 to 1.7 %. This method was successfully applied for the determination of phenoxazine in aqueous samples

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