Determination of the Packing Factor of Geopolymerized Perlite from Lamba, Albay, Bicol in the Philippines, Its Development and Characterization and the Design of a Packed Column for the Absorption of Ammonia Gas

2021 ◽  
pp. 47-60
Author(s):  
Lola Domnina Pestaño ◽  
Beatriz San Mateo ◽  
Jervin Valorozo ◽  
Ma. Niña Jasmer Yturralde
Keyword(s):  
Packed Column ◽  
The Philippines ◽  
Ammonia Gas ◽  
Packing Factor

scholarly journals Development and characterization of perlite from Lamba, Albay, Bicol as packing material and the design of a packed column for the absorption of ammonia gas

2019 ◽  
Vol 268 ◽  
pp. 04001
Author(s):  
Beatriz San Mateo ◽  
Jervin Valorozo ◽  
Ma. Niña Jasmer Yturralde ◽  
Lola Domnina Pestaño
Keyword(s):  
Compressive Strength ◽  
Packed Column ◽  
Vital Role ◽  
Packing Material ◽  
Gas Absorption ◽  
Unit Operation ◽  
Ammonia Gas ◽  
Packing Factor ◽  
Soluble Components

Gas absorption is a unit operation and separation process wherein soluble components of a gas mixture are dissolved in liquid solvent. This unit operation utilizes packing materials which play a vital role in providing surface area for gas and liquid contact. In this study, perlite from Lamba, Albay, Bicol was used in the production of packing material. The objectives of the study are to develop and characterize a packing material using a geopolymer derived from perlite and to design a packed column for the absorption of ammonia gas. The study determines the ideal perlite-Na2SiO3 concentration, packing factor, and L/D ratio. Three perlite-Na2SiO3 concentrations (45%, 60%, 75% wt. Na2SiO3) were subjected to various tests such as: thermal stability, chemical resistance, and compressive strength. The 45% wt. Na2SiO3 exhibited the least weight loss and the highest compressive strength making this geopolymerized perlite a potential packing material for gas absorption with a packing factor of 0.00175 ft-1. Based on the results, a packed column was designed for the absorption of ammonia gas with an L/D ratio of 2.5.

Detection of peroxyacetyl nitrate in air using chemiluminescence aerosol detector

2014 ◽  
Vol 68 (11) ◽  
Author(s):  
Pavel Mikuška ◽  
Lukáš Bružeňák ◽  
Zbyněk Večeřa
Keyword(s):  
Alkaline Solution ◽  
Limit Of Detection ◽  
Packed Column ◽  
Direct Reaction ◽  
Peroxyacetyl Nitrate ◽  
Brij 35 ◽  
Alternative Approach ◽  
Sensitive Determination ◽  
Triton X

AbstractA method for the rapid and sensitive determination of peroxyacetyl nitrate (PAN) in air based on a chemiluminescence reaction with an alkaline solution of luminol in the chemiluminescence aerosol detector is described. The PAN is chromatographically separated from nitrogen dioxide and ozone in a packed column filled with 5 % OV-1 on Chromosorb 30/60 and the eluted PAN is detected via the direct reaction with the luminol solution consisting of 0.002 mol L−1 luminol, 1 vol. % Brij-35 and 0.1 mol L−1 KOH. The limit of detection is 14.9 ng m−3 (3 ppt) of PAN. Alternatively, the PAN after separation is thermally converted to NO2 which is detected by the chemiluminescence reaction with a solution consisting of 0.002 mol L−1 luminol, 0.5 mol L−1 KOH, 0.2 mol L−1 Na2SO3, 0.1 mol L−1 KI, 0.05 mol L−1 EDTA and 0.5 vol. % triton X-100. The alternative approach affords the simultaneous determination of PAN and NO2. The limit of detection is 50 ppt of PAN and 50 ppt of NO2. The time resolution is 3 min. The method was applied to the measurement of ambient peroxyacetyl nitrate in air.

Determination of Phytosterols in Butter Samples by Using Capillary Column Gas Chromatography

1987 ◽  
Vol 70 (5) ◽  
pp. 912-915 ◽  
Author(s):  
Randall L Smith ◽  
Darryl M Sullivan ◽  
Earl F Richter
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Retention Time ◽  
Capillary Column ◽  
Limit Of Detection ◽  
Packed Column ◽  
Gas Chromatography Mass Spectrometry ◽  
Positive Bias ◽  
Capillary Column Gas Chromatography

Abstract A positive bias in the gas chromatographic (GC) analysis of butter for β-sitosterol was discovered when attempting to confirm values by gas chromatography/mass spectrometry (GC/MS). The source of the problem was traced to an interfering material that was not effectively separated by packed column GC. Because capillary columns are known to provide superior separation, they were substituted for packed columns in the assay, and instrument parameters were modified accordingly. A compound with a similar retention time, identified by GC/MS as lanosterol, was separated from β-sitosterol by the capillary column. The capillary column technique was applied to over 300 butter samples. The results indicate that the method can accurately quantitate β-sitosterol in butter with no known interferences. The limit of detection for this method is 1 mg/100 g. Recoveries at a level of 3 mg/100 g averaged 98% with a coefficient of variation of 3.45%

Wide-Bore Capillary Gas Chromatographic Determination of Organophosphorus Pesticide Residues in Foods: Interlaboratory Trial

1994 ◽  
Vol 77 (1) ◽  
pp. 92-101
Author(s):  
Charles H Parfitt
Keyword(s):  
Pesticide Residues ◽  
Stationary Phases ◽  
Packed Column ◽  
Capillary Columns ◽  
Packed Columns ◽  
Detector Response ◽  
Official Method ◽  
Methyl Silicone ◽  
Interlaboratory Trial

Abstract Wide-Bore capillary columns are often used as alternatives to traditionally packed columns for gas chromatographic (GC) determination of pesticide residues in foods. Fused silica columns with cross-linked, bonded stationary phases are reproducible, rugged, and easy to use and are substantially more inert than their packed column equivalents. An interlaboratory trial was conducted in 5 U.S. Food and Drug Administration laboratories to determine the practicability of using isothermal wide-bore capillary GC as an alternative to the packed column GC systems used in AOAC Official Methods for determining pesticide residues in foods. Two wide-bore capillary columns with flame photometric detection were evaluated with respect to the following: linearity of detector response; repeatability of response for equal and unequal injection volumes of standard solutions; accuracy of quantitating pesticides in food extracts when the injection volumes or analyte concentrations of the standard solution and the food extract are different; recoveries of 23 pesticides from 5 fortified food extracts, calculated from both duplicate and single injections; and relative retention times. Before shipment, food extracts supplied to participants were fortified with pesticides after preparation and extraction of the foods by Official Method 985.22. The performance of wide-bore capillary columns with cross-linked bonded methyl silicone and methyl phenyl silicone stationary phases was equal or superior to that of the packed columns specified in the Official Method.

Determination of N-(4-Chlorophenyl)-N´-(2,6-difluorobenzoyl)-urea in Milk by High-Speed Liquid Chromatography

1974 ◽  
Vol 57 (6) ◽  
pp. 1269-1271
Author(s):  
Calvin Corley ◽  
Richard W Miller ◽  
Kenneth R Hill
Keyword(s):  
Liquid Chromatography ◽  
Mobile Phase ◽  
High Speed ◽  
Packed Column ◽  
Sampling Interval ◽  
Detectable Level ◽  
Liquid Chromatograph ◽  
Whole Milk ◽  
Sensitive Method

Abstract A rapid and sensitive method of analysis in which high-speed liquid chromatography was used with ultraviolet absorption detection was developed for determining residues of Thompson- Hayward TH 6040 (N-(4-chlorophenyl)-N'- (2,6-dinuorobenzoyl)urea) in cows' milk. The larvicide is extracted from whole milk with ethyl acetate, and the lipids are removed by partitioning between hexane and acetonitrile. After evaporation of the acetonitrile, the residue is dissolved in ethanol, and aliquots are injected into a liquid chromatograph, using methanol-water (1+1) as the mobile phase in a packed column. Recovery of TH 6040 from cows' milk is essentially quantitative, and no interfering substances appear on the chromatogram. The lowest detectable level was 10 ng. Milk from a cow fed 1 mg larvicide/kg body weight daily in the diet was analyzed by this procedure, and no detectable residues (<0.1 ppm) were found over a 15 week sampling interval.

Determination of 19 Chlorophenols by Packed-Column Gas Chromatography

1984 ◽  
Vol 8 (6) ◽  
pp. 282-284
Author(s):  
Richard E. Cline ◽  
Larry L. Needham
Keyword(s):  
Gas Chromatography ◽  
Packed Column

Comparison and Selection of Different Medium on the Effect of Improving Soil Deodorization

2012 ◽  
Vol 610-613 ◽  
pp. 1328-1332
Author(s):  
Zu Xin Xu ◽  
Jian Xiu Huang ◽  
Huai Zheng Li ◽  
Wei Bing Chen ◽  
Wei Gang Wang
Keyword(s):  
Blast Furnace ◽  
Pressure Drop ◽  
Blast Furnace Slag ◽  
Removal Rate ◽  
Packed Column ◽  
Combined System ◽  
Ammonia Gas ◽  
Odor Concentration ◽  
Furnace Slag ◽  
Selection Of

Based on the investigation of odor concentration of retention tank in combined system, it aim at the removal of mixed odor and pressure drop with blast furnace slag, pebble, sand as improved medium and soil as contrast through mixed odor of ammonia gas and hydrogen sulfide made in lab-scale. The results showed that the removal rate of H2S by different medium packed column becomes stable after 12 days, and 35 days for NH3. Pressure drop of each column meets with Equation Ergum and under the same condition the order is as follows: soil>sand>pebble>blast furnace slag. And the removal rate of each medium is: soil>sand>blast furnace slag. The soil is good for removal but its pressure drop is so high that it limits flow charge, thus its removal rate is the lowest. As a result, sand and pebble as the medium for soil deodorization considering pressure drop and the effect of deodorization were chosen. It turns out that the removal rate of NH3 is higher than 65% while H2S higher than 98%.

scholarly journals Herbal Therapies and Social-Health Policies: Indigenous Ati Negrito Women’s Dilemma and Reproductive Healthcare Transitions in the Philippines

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Homervergel G. Ong ◽  
Young-Dong Kim
Keyword(s):  
Reproductive Health ◽  
The Philippines ◽  
Healthcare Intervention ◽  
Number Of Children ◽  
Female Reproductive Health ◽  
Semistructured Interviews ◽  
Health Related ◽  
Herbal Therapies ◽  
Reproductive Healthcare

The high maternal mortality in the Philippines in the past decades prompted intervention strategies to curb unwanted deaths of mothers and improve health and social conditions of women. Such introductions however have begun to challenge traditional reproductive health practices creating confusion among practitioners and incipient transitions in healthcare. Our aim in this study was to document the herbal therapies practiced by indigenous Ati Negrito women and discuss the implications of social and conventional healthcare intervention programs on reproductive healthcare traditions by conducting semistructured interviews. Fidelity Level index was used to determine culturally important plants (i.e., the most preferred). Review of related studies on most preferred plants and therapies was further carried out to provide information regarding their safety/efficacy (or otherwise). Determination of informants’ traditional medicinal knowledge was done using Mann-WhitneyUand Kruskal-Wallis tests. A total of 49 medicinal plants used in treating female reproductive health-related syndromes across four categories were recorded. Significant differences in traditional medicinal knowledge were recorded when informants were grouped according to age, education, and number of children. Issues discussed in this research could hopefully raise awareness on changes in healthcare practices in indigenous cultures and on medical safety especially when traditional and conventional medications interact.

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