Tag Archives: Zamir R

Active Acidity, Reserve Acidit y, Clay Content and Cation Exchange Capacity of Some Tea Soils of Bangladesh

Author
Zamir R
ABSTRACT:
Some soil samples were collected from Rungicherra Tea-Estate of Moulvibazar district, Bangla desh. Active acidity, reserve acidity, cation exchange capacity and clay content of the collected soil samples were determined. The measured parameters of the soil samples were plotted and analyzed with reference to site and topography. The parameters have been found to vary with sampling sites, depths and topography.

Persistent organohalogen contaminants in plasma from groups of humans with different occupations in Bangladesh

Author
Zamir R

Abstract

The present study is aimed to assess persistent organic halogenated pollutants in humans living in Bangladesh. The results are compared to other similar studies in the region and globally. Human blood plasma were collected from groups of men and women with different occupations, i.e. being students, garment industry workers, employees at the Power Development Board (PDB), all groups in Dhaka, fishermen and fishermen wife’s from Dhaka and another group from Barisal district. The plasma was analysed for hexachlorobenzene (HCB), the hexachlorocyclohexane isomers, α-HCH, β-HCH, γ-HCH and δ-HCH, the DDT group of chemicals, chlordane compounds, trans-chlordane, cis-chlordane, oxychlordane, trans-nonachlor, trans-heptachlorepoxide, methoxychlor and mirex. The most abundant contaminant, in all groups studied, p,p′-DDE is dominating, with p,p′-DDT/∑DDT ratios indicating recent and ongoing DDT exposure. Among the other pesticides analysed β-HCH is the most abundant indicating the use of technical HCH products instead of Lindane (γ-HCH). While the ∑DDT is present in the low ppm range the β-HCH is detected in up to approx. 400 ppb, lipid basis. The β-HCH is most abundant in the groups of students. In contrast to the pesticides analysed very low concentrations of polychlorinated biphenyls (PCB) are present in all study groups, with e.g. CB-153 in the range of 5–30 ng g−1 fat. The concentrations of the DDT group of chemical differ significantly between fishermen and fishermen’s wives living and working in the Dhaka area versus those living and working in Barisal. Also, fishermen and their wives had significantly different concentrations of DDT compared to garment industry workers.

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Persistent organohalogen contaminants in plasma from groups of humans with different occupations in Bangladesh.

Author
Zamir R

ABSTRACT:

The present study is aimed to assess persistent organic halogenated pollutants in humans living in Bangladesh. The results are compared to other similar studies in the region and globally. Human blood plasma were collected from groups of men and women with different occupations, i.e. being students, garment industry workers, employees at the Power Development Board (PDB), all groups in Dhaka, fishermen and fishermen wife’s from Dhaka and another group from Barisal district. The plasma was analysed for hexachlorobenzene (HCB), the hexachlorocyclohexane isomers, alpha-HCH, beta-HCH, gamma-HCH and delta-HCH, the DDT group of chemicals, chlordane compounds, trans-chlordane, cis-chlordane, oxychlordane, trans-nonachlor, trans-heptachlorepoxide, methoxychlor and mirex. The most abundant contaminant, in all groups studied, p,p’-DDE is dominating, with p,p’-DDT/Sigma DDT ratios indicating recent and ongoing DDT exposure. Among the other pesticides analysed beta-HCH is the most abundant indicating the use of technical HCH products instead of Lindane (gamma-HCH). While the Sigma DDT is present in the low ppm range the beta-HCH is detected in up to approx. 400 ppb, lipid basis. The beta-HCH is most abundant in the groups of students. In contrast to the pesticides analysed very low concentrations of polychlorinated biphenyls (PCB) are present in all study groups, with e.g. CB-153 in the range of 5-30 ng g(-1) fat. The concentrations of the DDT group of chemical differ significantly between fishermen and fishermen’s wives living and working in the Dhaka area versus those living and working in Barisal. Also, fishermen and their wives had significantly different concentrations of DDT compared to garment industry workers.

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Environmental exposure to POPs and heavy metals in urban children from Dhaka, Bangladesh

Author
Zamir R

Abstract:

Persistent organic pollutants (POPs) and heavy metals are well known environmental pollutants. Even though numerous studies have been carried out to assess human exposures to these compounds, there is still a lack of data on humans from developing countries, especially in underprivileged children. The objective of this study was to assess the exposure to POPs and heavy metals in children from Dhaka, Bangladesh. One specific aim was to investigate whether children working at, or living close to, open waste disposal sites (WDSs) were more heavily exposed than other urban children. In 2008, blood and serum were collected from 73 children aged 7–16 from five neighbourhoods. Some of the children lived and worked at WDSs (N = 31), others lived next to a WDS (N = 17), whereas some children lived far from such sites (N = 25). Blood levels of lead (B-Pb), cadmium (B-Cd), and selenium (B-Se) were determined by ICP-MS for all subjects. The metal levels were high, with B-Pb overall mean 120 μg L−1 (range 40–220), B-Cd 0.74 μg L−1 (0.22–4.1), and B-Se 120 μg L−1 (81–170). There were no marked differences between children from the different neighbourhoods, or between WDS workers and other children. PCB levels were low and with no contrast between neighbourhoods, for CB-153 the overall mean was 7.0 ng g−1 fat (2.8–51). In contrast, high levels of DDTs were observed in all children, for 4,4′-DDE 1300 ng g−1 fat (420–4600), and for 4,4′-DDT 326 ng g−1 fat (44–1400), indicating ongoing exposure. PBDE levels were low, and BDE-209 was quantitated mainly in children working at or living close to WDSs. In conclusion, the high levels of DDTs, lead and cadmium observed in children from Dhaka are of concern. Many children were exposed at levels where health effects have been observed, or at levels without safety margins.

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Organochlorine Pesticides in Three Fish Samples

Author
Zamir R

Introduction:

Use of organochlorine pesticides (OCP) is forbidden in Bangladesh, but evidences of the presence of OCP were found in the environmental samples (fish, dry fish, and poultry feed)1-2 and through the food chain in human blood samples as well3-4. The cause may be illegal trafficking of banned OCP from neighboring countries where OCP are allowed to use in health sector and pilferage from large stockpiles of OCP in the three godowns of Bangladesh5. Fish is one the most suitable bio-concentrators to identify OCP6. In continuation of our work on OCP, we are now reporting residual level of DDT (1,1,1-trichloro-2,2-bis(4- chlorophenyl)ethane) and its metabolites in three large sizes fish samples, Labeo rohita (rui), Katla katla (katla) and Pangasius pangasius (pangus).


DNA Damage in Lymphocytes in Hypertensive Subjects in Bangladesh

Author
M. Saiedullah
Zamir R

Abstract

Oxidative stress due to imbalance between the production of reactive oxygen species and their dismutation is claimed to be higher in hypertensive subjects than normotensive subjects. In hypertensive subjects oxidative stress may damage deoxy-ribonucleic acids (DNA). In this study plasma superoxide dismutase (SOD) activities, protein carbonyl contents (PCCs) and extent of DNA damage in lymphocytes were measured in specimens obtained from 86 subjects to compare oxidative stress and oxidative DNA damage between normotensive and hypertensive subjects and to assess their relationship with the degree of blood pressure. Results were expressed as mean±SD. Two-tailed unpaired t test and Pearson’s correlation test were done to compare or to determine the relationship between groups or variables. SOD activities were 2.85±0.12 unit/mg protein and 3.84±0.45 unit/mg protein (p<0.05) in hypertensive and normotensive groups respectively. PCCs were 4.77±0.36 nmol/mg protein and 3.75±0.23 nmol/mg protein in hypertensive and normotensive groups respectively. Olive tail moments (OTM) were 124.7±11.69 units and 108.9±9.27 units in hypertensive and normotensive groups respectively. The correlation coefficient of OTM was 0.3924 (p<0.05) for diastolic blood pressure and 0.3618 (p<0.05) for systolic blood pressure. Oxidative stress and DNA damage was higher in hypertensives than normotensives and DNA damage correlated positively with blood pressure

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