My Academic Publications
|Posted by Marian Asantewah Nkansah on September 10, 2013 at 6:50 AM||comments (0)|
Dear folks, for details on some of my recent articles, check my links to a collection at googlescholar on http://scholar.google.com/citations?hl=en&user=Ro-ktVgAAAAJ
|Posted by Marian Asantewah Nkansah on December 18, 2010 at 2:52 PM||comments (0)|
*Marian Asantewah Nkansah, Juliet Ofosuah and Sandra Boakye
Department of Chemistry,
Kwame Nkrumah University of Science and Technology, Kumasi - Ghana
The quality of ground water in the Kwahu West District of Ghana was determined by the use of
physicochemical parameters together with trace metal contamination as indices of quality.
Standard methods for physicochemical determinations were employed. Atomic Absorption
Spectrophotometer was also used for the measurement of nickel (Ni), lead (Pb), zinc (Zn), copper
(Cu) and iron (Fe). Nitrate, Chloride, Alkalinity and Phosphate were also determined
photometrically. Results were compared with global averages for freshwater and international
water quality standards for drinking water, World Heath Organisation, (WHO). Evaluation of
physicochemical parameters revealed that the water samples were within the maximum
permissible limits for consumption. All elements except iron, lead and nickel, were well within the
safety limits recommended by WHO. The low level of industrialization in the study area has kept
the water relatively free from heavy metal contamination
Keywords: Contamination, physico-chemical, trace metals, ground water
|Posted by Marian Asantewah Nkansah on October 5, 2010 at 7:09 AM||comments (0)|
Chemical quality of groundwater drawn from boreholes in the
Ashanti region of Ghana
M. A. NKANSAH1 & J. H. EPHRAIM2
1 Department of Chemistry, KNUST, Kumasi, Ghana
2 Catholic University of Ghana, Fiapre, Ghana
In the Ashanti Region of Ghana, the physicochemical quality of groundwater sampled from 38
wells in 24 communities in Ejisu-Juaben and Bosomtwi-Atwima-Kwanwoma districts was surveyed
between November 2004 and June 2005. Water samples were analysed for pH, electrical conductivity (EC),
SO42-, Cl-, PO43-, NO2- , Fe, Mn, Cu, Zn, Cd, Na, K and Pb. The results revealed wide variations in analysed
parameters: pH (4.0–8.0); EC (44–1110 μs·cm-1), turbidity (0.1–45 NTU), colour (<5–60 HU), hardness
(3–400 mg CaCO3·L-1), alkalinity (10–365 mg CaCO3·L-1), Cl-1 (5–92 mg·L-1), SO42- (0.5–17 mg·L-1), PO43-
(<0.01 to 2.4 mg·L-1) and NO2- (<0.01 to 0.08 mg·L-1). Elemental concentrations were Fe (0.06–3.4 mg·L-1),
Mn (<0.01–1.6 mg·L-1), Cu (0.01–1.3 mg·L-1), Zn (<0.01–3.3 mg·L-1), Cd (<0.001–0.006 mg·L-1), Pb
(<0.001–0.038 mg·L-1), Na (4–87 mg·L-1) and K (0.2–80 mg·L-1). With the exception of isolated cases of
trace metal contamination and turbidity, water from the boreholes in the two districts had acceptable quality
for domestic use.
Key words : groundwater; physicochemical; quality; trace metals
Groundwater and Climate in Africa (Proceedings of the Kampala Conference, June 2008) 36 IAHS Publ. 334, 2009.
|Posted by Marian Asantewah Nkansah on September 18, 2010 at 5:11 PM||comments (0)|
Heavy metal content of some common spices available in markets in the Kumasi metropolis of Ghana
Marian Asantewah NKANSAH, Cosmos OPOKU AMOAKO
Department of Chemistry, Kwame Nkrumah University of Science and Technology, Kumasi-
In recent years, there has been a growing interest in monitoring heavy metal contamination of
spices. The concentrations of some heavy metals (lead, zinc, nickel, copper, iron, and mercury) in
15 common spices available at local markets in the Kumasi Metropolis were determined using
Atomic Absorption Spectroscopy (AAS) from October, 2008 to February, 2009. The study showed
differences in metal concentrations according to the edible part (root, stem, leaf, and fruit). The
range of the concentrations of metals in dry weights were; Lead 0.1153 - 0.0973 g/kg, Zinc 0.074
- 0.059 g/kg, Nickel 0.0735 - 0.0593 g/kg, Copper 0.0210 - 0.009 g/kg, Iron 0.4942 - 0.1100 g/kg,
Mercury 1.300*10-6 - 2.493*10-5 g/kg respectively. Most of the levels in the spices were
acceptable with the exception of lead which was above the standard limit approved by WHO and
FAO for some of the samples. Consumers of these spices would not be exposed to any risk
associated with the daily intake of 10g of spices per day as far as metals; Zinc, Nickel, Copper,
Iron and Mercury are concerned. However Lead levels in Ginger, Negro pepper and Cinnamon
were above the standard value of 0.1 g/kg. Generally most of the spices available on the market
are safe for human consumption as far as trace metal levels are concerned.
Key words: Contamination, Heavy metals, Kumasi, Spices
Am. J. Sci. Ind. Res., 2010, 1(2): 158-163
|Posted by Marian Asantewah Nkansah on June 30, 2010 at 10:50 AM||comments (0)|
M. A. Nkansah and J. H. Ephraim
Department of Chemistry, Kwame Nkrumah University of Science and Technology-Kumasi,
The circumstances of available water to many Districts in Ghana reflect the global
situation where water supplies needed for development are scarce and often polluted. This has
prompted the digging of numerous boreholes in many rural communities in Ghana. Though
the numbers of boreholes are impressive, there is the need to determine and monitor the
quality of water that is being drawn for human activity.
This work determined physicochemical parameters of water from 21 boreholes from 13
communities in the Ejisu-Juaben (EJ) and 17 boreholes in 11 communities in the Bosomtwi-
Atwima-Kwanwoma (BAK) districts of the Ashanti Region of Ghana (West Africa) within
the period of November 2004 to June 2005 with the aim of accessing the quality.
Water samples were analysed for pH, Electrical Conductivity (EC), Turbidity, Colour,
Total Hardness, Total Alkalinity TDS, SO42-, Cl-, PO43-, NO2- , Fe, Mn, Cu, Zn, Cd, Na, K andPb.
The UV-Visible Spectrophotometer was used to determine SO42-, PO43- and NO2- concentration. An atomic Absorption Spectrophotometer was used to determine Fe, Mn, Cu,Zn, Cd, Pb. A flame photometer was used for the determination of Na and K, and titrimetry was employed to measure Alkalinity, Hardness and Chloride content.
The data showed the variation of the investigated parameters in samples as follows: pH
4.0-8.0, Electrical Conductivity (EC) 44 - 1114 μScm-1, Turbidity 0.11 - 45 NTU, Colour <5-
60 HU, TDS 31 -779 mgl-1, hardness 3-402 mgl-1, alkalinity 10-365 mgl-1 ,Cl- 5.0 - 92 mgl-1,SO42- 0.25-17.0 mgl-1, PO43- 0-2.4 mgl-1 and NO2- 0-0.08 mgl-1.
The rest were Fe 0.01-3.4 mgl-1, Mn 0-1.65 mgl-1, Cu 0.01 -1.3 mgl-1, Zn 0-3.3 mgl-1,
Cd 0 - 0.059 mgl-1, Pb 0-0.038 mgl-1, Na 4-87.0 mgl-1 and K 0.2-68 mgl-1.
With the exception of isolated cases of trace metal contamination and turbidity, the
general results showed that water from the boreholes in the two districts had acceptable
chemical quality for household activities
Keywords: trace metals, water, contamination, quality
Thammasat Int. J. Sc. Tech., Vol. 14, No. 3, July-September 2009
|Posted by Marian Asantewah Nkansah on June 30, 2010 at 10:47 AM||comments (4)|
Marian Asantewah Nkansah, Nathaniel Owusu Boadi and Mercy Badu
Department of Chemistry, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana.
This study focused upon the determination of physicochemical and microbial properties, including metals, selected anions and coliform bacteria in drinking water samples from hand-dug wells in the Kumasi metropolis of the Republic of Ghana. The purpose was to assess the quality of water from these sources. Ten different water samples were taken from different parts of Kumasi, the capital of the Ashanti region of Ghana and analyzed for physicochemical parameters including pH, electrical conductivity, total dissolved solids, alkalinity total hardness and coliform bacteria. Metals and anions analyzed were Ca, Mg, Fe, Mn, NO3-, NO2-, SO4 2-, PO4 2-, F- and Cl-. Bacteria analysed were total coliform and Escherichia coli.
The data showed variation of the investigated parameters in samples as follows: pH, 6.30–0.70; conductivity (EC), 46–682 µS/cm; PO43-, 0.67–76.00 mg/L; F-, 0.20–0.80 mg/L; NO3-, 0–0.968 mg/L; NO2-, 0–0.063 mg/L; SO4−2, 3.0–07.0 mg/L; Fe, 0–1.2 mg/L; Mn, 0–0.018 mg/L. Total coliform and Escherichia coli were below the minimum detection limit (MDL) of 20 MPN per 100 ml in all the samples. The concentrations of most of the investigated parameters in the drinking water samples from Ashanti region were within the permissible limits of the World Health Organization drinking water quality guidelines.
Keywords: hand-dug wells, metals, physiochemical, microbial, coliform
Categories: Environmental health :Environmental Health Insights 2010:4 7-12