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05 February 2014
A hidden opportunity: Collaborative Development of teaching and learning in Environmental Geochemistry and Health at the Department of Geology, University of Calabar, Nigeria

 

The topic of Environmental Geochemistry has existed as a postgraduate course of study in the Department of Geology, University of Calabar in Nigeria for the past eighteen years. After my Commonwealth Academic Fellowship in 2008-2009, hosted by Prof A.S Hursthouse at the School of Science, University of the West of Scotland, I became a member of SEGH. The skills acquired during this period and as a registered member of SEGH, we decided to review the existing environmental geochemistry curriculum during my tenure as the Head of Department in 2012, since being established in 1976, its first female to hold that post.

 

Through my colleagues in SEGH, I was able to consult widely with members of the International SEGH board to review and gather opinion on the programme topics and syllabus content. This exercise was of great help and a real benefit to get feedback from the environmental geochemistry and health community, giving a real international perspective. It has helped to provide a good justification for changes to the programme in discussion with our University. The course was approved as an area of specialization under Environmental Geoscience section starting from 2013/2014 session. It is among the courses currently being advertised by the graduate school for this session and it will be in cooperated into the new graduate school brochure of the University to help to give it a wider publicity. It is anticipated that in future this will be extended to the undergraduate level when the curriculum will be reviewed as well.

We also hope that with further support from the members of SEGH we will be able to carry out some collaborative research where we lack the necessary laboratory facilities and some graduate students will be able to benefit from the expertise of SEGH members as the need arises.

At this juncture, I would like to thank members of SEGH for their input in structuring of the curriculum.

 

Dr Therese Nganje

University of Calabar

 

 

Pictures:

  1. Dr Therese Nganje with Departmental alumni, 2012
  2. Students of the Department of Geology, University of Calabar, 2012
  3. University of Calabar
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Latest on-line papers from the SEGH journal: Environmental Geochemistry and Health

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    Abstract

    Investigation of SiO2 nanoparticles (NPs) effect on Eisenia fetida showed no toxic effect of the metal at a concentration of 250, 500 and 1000 mg per kg of soil, but conversely, a biomass increase from 23.5 to 29.5% (at the protein level decrease from 60 to 80%). The reaction of the earthworm organism fermentative system was expressed in the decrease in the level of superoxide dismutase (SOD) on the 14th day and in the increase in its activity to 27% on the 28th day. The catalase level (CAT) showed low activity at average element concentrations and increase by 39.4% at a dose of 1000 mg/kg. Depression of malonic dialdehyde (MDA) was established at average concentrations of 11.2% and level increase up to 9.1% at a dose of 1000 mg/kg with the prolongation of the effect up to 87.5% after 28-day exposure. The change in the microbiocenosis of the earthworm intestine was manifested by a decrease in the number of ammonifiers (by 42.01–78.9%), as well as in the number of amylolytic microorganisms (by 31.7–65.8%). When the dose of SiO2 NPs increased from 100 to 1000 mg/kg, the number of Azotobacter increased (by 8.2–22.2%), while the number of cellulose-destroying microorganisms decreased to 71.4% at a maximum dose of 1000 mg/kg. The effect of SiO2 NPs on Triticum aestivum L. was noted in the form of a slight suppression of seed germination (no more than 25%), an increase in the length of roots and aerial organs which generally resulted in an increase in plant biomass. Assessing the soil microorganisms’ complex during introduction of metal into the germination medium of Triticum aestivum L., there was noted a decrease in the ammonifiers number (by 4.7–67.6%) with a maximum value at a dose of 1000 mg/kg. The number of microorganisms using mineral nitrogen decreased by 29.5–69.5% with a simultaneous increase in the number at a dose of 50 mg/kg (+ 20%). Depending on NP dose, there was an inhibition of the microscopic fungi development by 18.1–72.7% and an increase in the number of cellulose-destroying microorganisms. For all variants of the experiment, the activity of soil enzymes of the hydrolase and oxidoreductase classes was decreased.

  • Seasonal characteristics of chemical compositions and sources identification of PM 2.5 in Zhuhai, China 2018-08-16

    Abstract

    Fine particulate matter is associated with adverse health effects, but exactly which characteristics of PM2.5 are responsible for this is still widely debated. We evaluated seasonal dynamics of the composition and chemical characteristics of PM2.5 in Zhuhai, China. PM2.5 characteristics at five selected sites within Zhuhai city were analyzed. Sampling began on January 10, 2015, and was conducted for 1 year. The ambient mass concentration, carbon content (organic and elemental carbon, OC and EC), level of inorganic ions, and major chemical composition of PM2.5 were also determined. Average concentrations of PM2.5 were lower than the National Ambient Air Quality Standard (NAAQS) 24-h average of 65 μg/m3. The daily PM2.5 concentration in Zhuhai city exhibited clear seasonal dynamics, with higher daily PM2.5 concentrations in autumn and winter than in spring and summer. Carbon species (OC and EC) and water-soluble ions were the primary components of the PM2.5 fraction of particles. Apart from OC and EC, chemical species in PM2.5 were mainly composed of NH4+ and SO42−. There was a marked difference between the summer and winter periods: the concentrations of OC and EC in winter were roughly 3.4 and 4.0 times than those in summer, while NH4+, SO42−, NO3, and Na+ were 3.2, 4.5, 28.0, and 5.7 times higher in winter than those in summer, respectively. The results of chemical analysis were consistent with three sources dominating PM2.5: coal combustion, biomass burning, and vehicle exhaust; road dust and construction; and from reaction of HCl and HNO3 with NH3 to form NH4Cl and NH4NO3. However, additional work is needed to improve the mass balance and to obtain the source profiles necessary to use these data for source apportionment.

  • Estimates of potential childhood lead exposure from contaminated soil using the USEPA IEUBK model in Melbourne, Australia 2018-08-14

    Abstract

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