A method to circumvent the lot number of activated carbon affecting the performance of activated carbon silica gel columns used for cleanup of blood samples for analysis of 29 hazardous organochlorine compounds

The Analyst ◽  
2005 ◽  
Vol 130 (4) ◽  
pp. 557 ◽  
Author(s):  
Kimiyoshi Kitamura ◽  
Yoshikatsu Takazawa ◽  
Shunji Hashimoto ◽  
Jae-Won ChoiPresent address: Organic Chemis ◽  
Hiroyasu Ito ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Silica Gel ◽  
Organochlorine Compounds ◽  
Blood Samples

Adsorption Properties of N2O on Zeolite 5A, 13X, Activated Carbon, ZSM-5, and Silica Gel

2019 ◽  
Vol 64 (8) ◽  
pp. 3473-3482 ◽  
Author(s):  
Tongbo Wu ◽  
Yuanhui Shen ◽  
Li Feng ◽  
Zhongli Tang ◽  
Donghui Zhang
Keyword(s):  
Activated Carbon ◽  
Silica Gel ◽  
Adsorption Properties ◽  
Zeolite 5A

Establishing the Association between Blood Levels of Chloroform in Children and Concentrations of Chloroform and Its Derivatives in Drinking Water of Centralized Water Supply Systems

2020 ◽  
pp. 58-63
Author(s):  
TS Ulanova ◽  
TV Nurislamova ◽  
OA Mal'tseva ◽  
NA Popova
Keyword(s):  
Drinking Water ◽  
Carbon Tetrachloride ◽  
Health Effect ◽  
Test Group ◽  
Water Disinfection ◽  
Organochlorine Compounds ◽  
Blood Levels ◽  
Water Supply Systems ◽  
Blood Samples ◽  
Observation Area

Background: Surface reservoirs remain one of the priority sources of drinking water in the Russian Federation whereas the increasing anthropogenic effect on the environment does not exclude the possibility of contamination of surface waters with toxic compounds. The use of traditional methods of water disinfection with active chlorine aggravates the situation and leads to formation of highly toxic organochlorine compounds. In this regard, one of the urgent hygienic problems is to establish health effect of these toxicants in the population including its most sensitive groups. The objective of the study was to establish and quantify the relationship between concentrations of chloroform and its derivatives in drinking water and blood levels of organochlorine compounds in children consuming potable water with a higher content of chlorine and its derivatives. Materials and methods: The study was conducted on six territories of the Perm Region constituting an observation area where drinking water was noncompliant with hygienic standards by a number of indices, and a comparison area. The analysis of trihalomethanes in drinking water samples was carried out in accordance with the requirements of sanitary regulations SanPiN 2.1.4.1074–01. The levels of trihalomethanes (chloroform, carbon tetrachloride, dibromochloromethane, dichlorobromethane, and 1,2-dichloroethane) in children’s blood samples were analyzed by capillary gas chromatography in combination with a specific detector to increase selectivity and sensitivity of determination. We used a Kristall-5000 gas chromatograph with an Optima-5 capillary column (25 m × 0.32 mm × 0.5 μL) and a selective electron capture detector (ECD). Results: The data of comprehensive chemical analyses of average levels of trihalomethanes in blood samples of children consuming drinking water with an increased content of determined compounds (up to 3.5 MPC) and the water complying with hygienic standards are presented. We observed significant differences (р<0.005) between two groups in the blood levels of chloroform, carbon tetrachloride, and 1,2-dichloroethane that were 5.6, 6 and 24 times higher in children of the test group compared to the controls. Conclusion: We revealed a statistically significant causal relationship between the increase in chloroform concentrations in drinking water and the increase in blood levels of chloroform in children described by the equation у=0.00188+0.01782х (R2=0.263, p=0.0018).

Determination of Fluorene in Fish, Sediment, and Plants

1986 ◽  
Vol 69 (6) ◽  
pp. 944-951
Author(s):  
Jon A Lebo ◽  
Lawrence M Smith
Keyword(s):  
Liquid Chromatography ◽  
Activated Carbon ◽  
Sulfuric Acid ◽  
Silica Gel ◽  
Fluorescence Detection ◽  
Potassium Silicate ◽  
Limits Of Detection ◽  
Carbon Efficiency ◽  
Gel Permeation

Abstract Methods and their applications are described for the determination of fluorene in fish, sediment, and plants. Sample extracts are enriched by using 2 or more of the following: gel permeation, silica gel, potassium silicate, sulfuric acid-impregnated silica gel, and activated carbon. Efficiency was improved by applying the adsorbents in combination or as tandem enrichment modules. Analyses by liquid chromatography (LC) with ultraviolet or fluorescence detection (LC/UV or LC/F) yielded limits of detection of 30, 3, and 30 ng/g and average recoveries of 80, 81, and 74% for fish, sediment, and plants, respectively.

Incidence of Adsorption Process on the Reduction of Trihalomethanes Precursory in Algerian Surface Water

2014 ◽  
Vol 1065-1069 ◽  
pp. 3065-3070
Author(s):  
Saâdia Guergazi ◽  
Khemissi Yahiaoui ◽  
Samia Achour
Keyword(s):  
Activated Carbon ◽  
Surface Water ◽  
Humic Substances ◽  
Surface Waters ◽  
Adsorption Process ◽  
Organochlorine Compounds ◽  
Powder Activated Carbon ◽  
Remarkable Reduction ◽  
Very High

The objective of our work is to test the performance of activated carbon on the elimination of humic substances by adsorption before chlorination in order to reduce the trihalomethane precursor of humic substances for two types of surface waters of Biskra region (South East of Algeria). During the chlorination, the results showed that the potential of consumption chlorine is very high for raw surface water tested and accompanied by a rather significant quantity of the trihalomethanes. The adsorption of humic substances on powder activated carbon showed that the activated carbon whatever its form effectively removes humic substances and the yield could reach 98%. For coupling adsorption / chlorination, the results showed that adsorption induced a significant and even a remarkable reduction in both of potential of chlorine consumption and the training potential of organochlorine compounds especially trihalomethanes.

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