A5070113392- Toxic Organic Pollutants Impact
- Effects and risks of endocrine disrupting chemicals
- Pesticide Residue Analysis and Safety
- Analytical Chemistry and Chromatography
- Analytical chemistry methods development
- Environmental Toxicology and Ecotoxicology
- Heavy metals in environment
- Water Quality and Pollution Assessment
- Microbial bioremediation and biosurfactants
- Air Quality and Health Impacts
- Chemical Thermodynamics and Molecular Structure
- Environmental Justice and Health Disparities
- Atmospheric chemistry and aerosols
- Aquatic Invertebrate Ecology and Behavior
- Analytical Methods in Pharmaceuticals
- Freshwater macroinvertebrate diversity and ecology
- Analytical Chemistry and Sensors
- Microplastics and Plastic Pollution
- Environmental Chemistry and Analysis
- Melamine detection and toxicity
- Agricultural Innovations and Practices
- Radiation Detection and Scintillator Technologies
- Heavy Metal Exposure and Toxicity
- Environmental remediation with nanomaterials
- Ectopic Pregnancy Diagnosis and Management
National Metrology Institute of South Africa
2011-2024
North-West University
2006-2014
Science North
2014
GS1 South Africa
2011
Currently very little data exists on the presence of persistent organic pollutants (POPs) and polycyclic aromatic hydrocarbons (PAHs) in South African environment. To address this gap a preliminary study highly industrialised area Africa, Vaal Triangle, was done. Soil sediment samples from as well other areas central were analysed with high resolution gas chromatography-high mass spectrometry (HRGC/HRMS) for PAHs, polychlorinated biphenyls (PCBs), dioxin-like chemicals organochlorine...
Polycyclic aromatic hydrocarbons (PAHs) are of global concern due to their ubiquitous presence, toxicity, and carcinogenicity. No data on PAHs in soils from South Africa have been published, even though it has the largest economy industrial base Africa. During this initial assessment, levels were determined sediments collected central Africa, specifically targeting industrial, residential, agricultural areas. Analysis was performed by gas chromatography/mass spectrometry (GC/MS). The total...
Main text The CCQM-K148.b comparison, undertaken with a parallel pilot study CCQM-P187.b, was coordinated by the BIPM and UME on behalf of Consultative Committee for Amount Substance: Metrology in Chemistry Biology (CCQM) Working Group Organic Analysis (OAWG). It National Measurement Institutes (NMIs) Designated (DIs) which provide measurement services organic analysis under CIPM Mutual Recognition Arrangement (MRA) designated Track A comparison within OAWG implementation CCQM Strategy...
Main text The CCQM-K179 comparison, undertaken with a parallel pilot study CCQM-P224, was coordinated by the BIPM and UME on behalf of Consultative Committee for Amount Substance: Metrology in Chemistry Biology (CCQM) Working Group Organic Analysis (OAWG). It National Measurement Institutes (NMIs) Designated (DIs) which provide measurement services organic analysis under CIPM Mutual Recognition Arrangement (MRA) designated Track C comparison within OAWG implementation CCQM Strategy Programme...
This study was conducted to evaluate the ecosystem health of Olifants River by means semi-quantitative surveys macroinvertebrates at 7 selected sites in catchment. These were performed during high- and low-flow seasons for 2 consecutive years. Macroinvertebrates collected using a net consisting 30 cm square steel frame with sturdy handle, which Perlon gauze mesh 1 mm attached. Semi-quantitative done sampling vegetation, as well substratum, each site approximately 15 min. The pH, water...
AbstractBiodiversity is frequently seen as an indicator of ecological health. Therefore a survey the macroinvertebrates Olifants River, one most polluted rivers in South Africa, was conducted 2010–2011. Four surveys were at total seven sampling sites four ecoregions, Highveld-Upper, Highveld-Lower, Lowveld-Lower and Eastern Escarpment mountain range, using sweepnets to sample vegetation substratum. Conductivity, pH temperature measured situ. Macroinvertebrates identified family level...
Main text The CCQM-K148.a comparison was coordinated by the BIPM on behalf of CCQM Organic Analysis Working Group for NMIs and DIs which provide measurement services in organic analysis under CIPM MRA. It undertaken as a "Track A" within OAWG strategic plan. demonstrates capabilities assigning mass fraction content solid compound having moderate molecular complexity, where has molar range (75 - 500) g/mol is non-polar (pK ow < −2), when present primary component neat material excess 950...
The comparison required the assignment of mass fraction folic acid present as main component in sample. Performance is representative a laboratory's measurement capability for purity organic compounds medium structural complexity [molecular weight range 300–500] and high polarity ( pK OW < −2). Methods used by eighteen participating NMIs or DIs were based on balance (summation impurities) qNMR approach, combination data obtained using both methods. results tended to give slightly lower...
The key comparison CCQM-K102: Polybrominated diphenyl ethers in sediment was coordinated by the JRC, Directorate F - Health, Consumers & Reference Materials, Geel (Belgium) under auspices of Organic Analysis Working Group (OAWG) Comité Consultatif pour la Quantité de Matière (CCQM). Thirteen National Metrology institutes or Designated Institutes and JRC participated. Participants were requested to report mass fraction (on a dry basis) BDE 47, 99 153 freshwater study material. originated...
Abstract A passive sampling device, based on molecularly imprinted membranes (MIM), was fabricated and optimised for polychlorinated biphenyls (PCBs) in aquatic ecosystems. The newly-developed sampler subjected to in-situ calibration studies determine PCB rates under various conditions of water turbulence temperature. This carried out by exposing the samplers spiked with PCBs a continuous-flow exposure setup. were preloaded known concentrations performance reference compounds (PRCs) prior...
Access to safe drinking water is a basic human right in South Africa. Therefore, the accurate measurement of quality critical ensuring safety prior its intended use. Proficiency testing schemes (PTSs) are recognised form assessing technical competence laboratories performing these analyses. There over 200 Africa, with only 51 being accredited for some or all parameters (physical, chemical and microbiological content) prescribed SANS 241. Only limited number test organic contaminants, as this...
Polycyclic aromatic hydrocarbons (PAHs) in the aquatic ecosystems of Soweto and Lenasia Polycyclic are fused benzene rings containing only hydrogen carbon atoms. The aim study is to determine concentrations origins 16 priority PAHs, ecotoxicological effects they may have on ecosystem possible risk human population.