An alkaline agent, namely food additive grade calcium hydroxide (FdCa(OH)2) in solution at 0.17%, was evaluated for its bactericidal efficacies in chiller water with sodium hypochlorite (NaOCl) at a concentration of 200 ppm total residual chlorine. Without organic material presence, NaOCl could inactivate Salmonella Infantis and Escherichia coli within 5 sec, but in the presence of fetal bovine...

This study is focused on synthesis of nano-colloidal silica via alkaline water glass solution. Sodium ions of water glass were removed by cation exchanging in a resin column to obtain the silicic acid which was titrated to the solution of sodium silicate. Concentration of the colloidal silica and pH value of the solutions were controlled using different concentrations of alkaline sodium silicat...

Enzyme solutiens of glucoamylase, acid protease, alkaline protease and lipase were treated with micro-bubbles otsupercritical carbon dioxide (SC CO,) fed from a cylindrical filter nozzle. The microbllbbles of SC C02 could increase the CO, concentration in the sample solution from O.4 to O.92molfl at 25 MPa and 350C, and hence could improye the eMciency of inactiyation by about 3 times compared ...

Abstmct The development of a miniaturized ammonia sensor is described. First, gas is sampled into an acid sample solution using a miniaturized gas sampler. Subsequently, the solution is pumped into a selector, comprising two channels separated by a gas permeable, water repellent polypropylene membrane, while adding an alkaline solution to dissociate all acid gasses and neutralize the alkaline g...

This study is focused on synthesis of nano-colloidal silica via alkaline water glass solution. Sodium ions of water glass were removed by cation exchanging in a resin column to obtain the silicic acid which was titrated to the solution of sodium silicate. Concentration of the colloidal silica and pH value of the solutions were controlled using different concentrations of alkaline sodium silicat...

The absorbance of an alkaline solution of 4-nitrophenyl phosphate is a function of temperature. Quantitative evaluation of this phenomenon indicates that it (a) depends on the concentration of the compound and is independent of source, buffer concentration, and pH above 9.0; (b) is reversible; (c) is not a result of alkaline hydrolysis or 4-nitrophenol contamination; and (d) correlates with a t...

1. The rate of the saponification of iodoacetic acid in sodium hydroxide and alkaline buffer solutions yielding glycollic acid was measured by means of Heyrovský's polarographic method. 2. From the bimolecular velocity constants, increasing with the ionic strength of the solution, the Brönsted factor, F, which characterizes the primary salt effect, was calculated. 3. In the borate buffer soluti...

In a double-blind study the fiberoptic bronchoscope was contaminated with five pathogenic organisms, each at a concentration of 10(9) organisms per milliliter. The shaft and inner channel of the bronchoscope were cleansed with five antiseptic regimens. Each regimen included equal 120-ml aliquots of one, two, or three solutions, respectively. The five different regimens were as follows: (1) phys...