PDF Version [114 KB] This Public Health Statement is the summary chapter from the Toxicological Profile for total petroleum hydrocarbons (TPH). It is one in a series of Public Health Statements about hazardous substances and their health effects. A shorter version, the ToxFAQs TM, is also available.
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Given the importance of TPH as a tool for screening environmental media for petroleum product contamination, and the fact that more than a decade has passed since the development of the PPRTVs for the various TPH fractions, the purpose of this current assessment is to reevaluate and update the provisional toxicity values (pRfDs and pRfCs) for ...
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Key to the riskbased assessment of TPH in vapor intrusion investigations is the assignment of inhalation toxicity factors or "Reference Concentrations (RfC)" to individual, volatile carbon ranges. A summary of published inhalation toxicity factors for carbon ranges is presented in Table 4. Lower RfCs reflect progressively increasing ...
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Total petroleum hydrocarbons and THC were analyzed using Gas Chromatography (GCFID) and UVVISIBLE spectrophotometer respectively. The results obtained from TPH analysis indicates that; 15, ...
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A new TPH fractionation strategy with ten fractions was proposed (Table 1) to enhance the feasibility of the risk assessment TPH fractions, simpler than TPHCWG fractions, were made by excluding aromatic EC57 and aromatic EC78 fractions since these fractions refer to benzene and toluene, respectively, and they can be analyzed using the wellestablished method as risk indicator ...
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Petroleum has always been a very important energy source for humans. However, during the process of extraction, storage, transportation, and use of petroleum, accidental leakage often causes soil pollution [1,2,3].Aliphatic, cycloaliphatic, and aromatic hydrocarbons are mainly included in petroleum components, which were collectively referred to as total petroleum hydrocarbons (TPH).
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Petroleum products can be made up of hundreds of individual petroleum hydrocarbons. TPH is a value that represents the amount of petroleum hydrocarbons in a given sample, as previously presented in Section There are far more than 250 individual chemicals that are known as petroleum hydrocarbons and there is an inherent complexity involved in chemically and physically describing and ...
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Oxidation of total petroleum hydrocarbons (TPH) under various soil:solution ratios (w:v). In each reactor, 15 g of dieselcontaminated soil was treated with a different volume of reagent solution containing 3% PMS and % nZVI for a 2 h reaction time. The letters (ac) above the bars indicate significant differences (p <, Tukey's test).
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A Ciboria sp. strain (Phylum Ascomycota) was isolated from hydrocarbonpolluted soil of an abandoned oil refinery in Italy. The strain was able to utilize diesel oil as a sole carbon source for growth. Laboratoryscale experiments were designed to evaluate the use of this fungal strain for treatment of the polluted soil. The concentration of total petroleum hydrocarbons (TPH) in the soil was ...
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Concentrations (RfCs) for Total Petroleum Hydrocarbons (TPH)(1997, Amherst Scientific Publishers) provides the technical basis for the development of TPH fractionspecific RfDs and RfCs for use in the hazard assessment step of the Working Group's riskbased approach to establishing soil cleanup levels at petroleum contaminated sites. Volume 5.
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٥. سرﻬﻔﻟا ١٣ ..... ﺔﻤدﻘﻤ ١٥ ..... ﻲﺌﺎﻴﻤﻴﻛﻟا ﺎﻬﺒﻴﻛرﺘو بوﺒﺤﻟا ﺔﻴﻤﻫأ ﻝوﻷا ﻝﺼﻔﻟا
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Biodegradation has been considered as an ideal technique for total petroleum hydrocarbon (TPH) contamination, but its efficiency is limited by its application in the field. Herein, an original TPHdegrading strain, SCYY5, was isolated from contaminated oil sludge and identified as Acinetobacter sp. by 16S rDNA sequence analysis. The biological function of the isolate was investigated by heavy ...
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Total petroleum hydrocarbons (TPH) is a term used to describe a large family of several hundred chemical compounds that originally come from crude oil. Crude oil is used to make petroleum products, which can contaminate the environment. Because there are so many different chemicals in crude oil and in other petroleum products, it is not practical to measure each one separately.
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Under the experimental conditions, the maximum ultrasonic desorption enhancement of the total petroleum hydrocarbons (TPH) reached 22% for soil A, 61% for soil B, and 49% for soil C, respectively.
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Total petroleum hydrocarbons ( TPH) is a term used for any mixture of hydrocarbons that are found in crude oil. There are several hundred of these compounds, but not all occur in any one sample. Crude oil is used to make petroleum products, which can contaminate the environment.
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1. Introduction. Soil total petroleum hydrocarbon (TPH) pollution in petroleum exploitation areas is a worldwide environmental problem. There are large amounts of TPH−contaminated soils in major oil fields worldwide, such as those in the Middle East ([AlSarawi and Massoud, 1998], [Besalatpour et al, 2008]), North America ([Iturbe et al, 2004], [Maddela et al, 2016]), western Africa (Adeniyi ...
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In recent years, researchers have become more and more interested in using tanninrich plants and plant extracts in ruminant diets to improve the quality of animal products. Some research results show that plant tannins can effectively improve the quality of meat and milk, and enhance the oxidative stability of the product.
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On this page: Withdrawal of approved methods employing CFC113. Recommended method for testing oil and grease and total petroleum hydrocarbons. EPA Method Source for n hexane for use with EPA Method 1664A. Use of repetitive amounts of silica gel with EPA Method 1664A. Reports on replacement of Freon with hexane as the extraction solvent.
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The optimization of the washing conditions, such as stirring speed, liquidsolid ratio, number of washing stages, and surfactant concentration, was carried out using a design of experiments (DOE) software, so that the maximum extraction efficiency of total petroleum hydrocarbons (TPHs) was achieved. A TPH removal efficiency of ( ± ...
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Maximum TPH degradation could be observed in the set amended with XHN consortium and 30 mM nitrate (BSBAXHN). The initial TPH of 320 ± 25 g kg −1 was reduced to 46 g kg −1 in BSBAXHN setup and 112 g kg −1 in BSBAXLN. In anaerobic bioremediation setups (BAAHN and BSBAAHN), rate and extent of TPH degradation was inhibited (36% in 30 days).
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TPH and PAHs were significantly degraded in all treatments (72 to 79% and 83 to 87%, respectively), and the biodegradation values were higher when nutrients were not added, especially for benzo(a)anthracene and chrysene. The moisture content and aeration were determined to be the key factors associated with PAH bioremediation.
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After harvest, TPH in plant samples were measured, and it was determined that the uptake of TPH by the plants gradually increased as the concentration of oil in soil increased. Further, from GCMS analysis, it was observed that PAHs including naphthalene and phenanthrene bioaccumulated in rice plant parts. Vital physicochemical properties of ...
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The effects of soil microparticles and micropores on the release of total petroleum hydrocarbons (TPH) were investigated using longterm weathered, TPHcontaminated soil samples. The TPH concentrations were analyzed using various extraction schemes (, total extraction, weak extraction, solvent extraction with or without ultrasound). The particle size distribution (<2 mm, mm, <0 ...
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The term "Total petroleum hydrocarbons" (TPH) is used to describe a complex mixture of petroleumbased hydrocarbons primarily derived from crude oil. Those compounds are considered as persistent organic pollutants in the terrestrial environment. A wide array of organic amendments is increasingly used for the remediation of TPHcontaminated ...
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The acronym PHC (petroleum hydrocarbons) is widely used to refer to the hydrogen and carboncontaining compounds originating from crude oil, but PHC should be distinguished from TPH, because TPH is specifically associated with environmental sampling and analytical results.
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This chapter summarizes useful background materials dealing with petroleum production and a range of common products derived from petroleum contaminants that could be documented through TPH testing at NPL sites. The chapter concludes with a discussion of acceptable disposal practices for petroleum products. In conjunction with materials in Chapter 5, the section on disposal summarizes special ...
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"طحن الحبوب باستخدام الرحى "تستخدم المرأة الإماراتية قديما «الرحى» لطحن الحبوب، ففي البيوت الإماراتية ...
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يرغب أحد موردي المواد من بلجيكا في إنتاج مسحوق الحجر الجيري لملابسه...
الهند غنية بالموارد المعدنية المختلفة وهي سوق مهم لمعالجة المعادن
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