The spatial variability in the concentrations of 1,2,3,4,5,6-hexachlorocyclohexane (HCH) and 1,1,1-trichloro-2,2-bis-(p-chlorophenyl) ethane (DDT) in surface soils was studied on the basis of the analysis of 131 soil samples collected from the surface layer (0-20 cm depth) of the alluvial region of Beijing, China. The concentrations of total HCHs (including alpha-, beta-, gamma-, and delta-isom...

To evaluate environmental changes in the Antarctic Ocean, concentrations of organochlorines (PCBs, DDTs, HCHs, HCB and CHLs) were determined in the blubber of the mature males of Antarctic minke whales, Balaenoptera bonaerensis, (from 21 to 25 years) from the Antarctic Areas IV and V. The ranges of concentrations for each compound were, in ng/g fat wt: PCBs, 7.7-89; DDTs, 29-340; HCHs, 0.20-4.3...

Hexachlorocyclohexane isomers (HCHs) are one of the most ubiquitous and most easily detected organochlorine pesticides in environmental samples. This global distribution is enabled by HCH persistence. Moreover, HCH tend to bioaccumulate in human and animal adipose tissue. Since certain HCHs cause central nervous system, reproductive, and other endocrine damage there is necessity of a suitable r...

the levels of 19 organochlorine pesticides (ocps) in surface water and under water sedimentsfrom tanks located nearby the prime agricultural areas of kanyakumari district, tamil nadu, india wereinvestigated to evaluate their pollution risks. a total of 36 surface water samples at 9 sampling sites and27 sediment samples at 9 sampling stations were collected from tanks, which were the water sourc...

Soils contaminated with hexachlorocyclohexanes (HCHs) are a legacy of the heavy use lindane during 20th century. This pesticide production generated large amounts residues other HCH isomers, which were habitually mismanaged. The sediments treated in this work (coming from an old landfill) example environmental problem global dimensions. efficient remediation these sediments, mainly β-HCH (99 mg...

the levels of 19 organochlorine pesticides (ocps) in surface water and under water sedimentsfrom tanks located nearby the prime agricultural areas of kanyakumari district, tamil nadu, india wereinvestigated to evaluate their pollution risks. a total of 36 surface water samples at 9 sampling sites and27 sediment samples at 9 sampling stations were collected from tanks, which were the water sourc...

The desorption of hydrophobic organic compounds (HOCs) and limited mass transfer in soil systems is a significant challenge for efficient remediation by oxidation treatments. utilization sonochemistry promising technology to enhance the decontamination HOCs-polluted soils. In this work, ultrasound (US) was coupled NaOH activating persulfate (PS) real polluted with hexachlorocyclohexanes (HCHs) ...

Mussel samples were used in this study to measure the levels of polybrominated diphenyl ethers (PBDEs) and organochlorines (OCs) in the coastal waters of Asian countries like Cambodia, China, Hong Kong, India, Indonesia, Japan, Korea, Malaysia, the Philippines, and Vietnam. PBDEs were detected in all the samples analyzed, and the concentrations ranged from 0.66 to 440 ng/g lipid wt. Apparently ...

Concentrations of polybrominated diphenyl ethers (PBDEs), and organochlorine pesticides (OCPs; DDTs, HCHs, CHLs, and HCB) were measured in human breast milk samples collected across Massachusetts, USA, in 2004. Seventeen PBDE congeners were found in the samples, ranging in concentration from 0.06 to 1910 ng g(-1) lipid wt. BDE-47 (2,2',4,4'-tetraBDE), BDE-99 (2,2',4,4',5-pentaBDE), and BDE-100 ...

Twelve species of deep-sea fishes collected in 2005 from the western North Pacific, off-Tohoku, Japan were analyzed for persistent organochlorine compounds (OCs) and brominated flame retardants (BFRs). PCBs and DDTs were the predominant contaminants, followed by CHLs > HCB ≈ HCHs ≈ HBCDs > PBDEs. Concentrations of DDTs and CHLs were lower than those reported in 1994–95 from the same area. PCBs,...