Datson H.,DustScan Ltd. |
Hall D.,Envirobods Ltd. |
Birch B.,Blastlog Ltd.
Atmospheric Environment | Year: 2012
Fugitive dust from industrial sites is problematic to quantify and can be associated with nuisance complaints. Despite significant limitations, the British Standard 1747 Part 5 (BS 1747:5) directional dust gauge remains preferred for monitoring fugitive dust flux on site boundaries. An alternative directional dust gauge, DustScan, was developed at the University of Leeds, UK, and uses cylindrical adhesive 'sticky pads' to sample dust in flux. With this sampler, dust capture is measured as soiling, as opposed to mass, with the BS 1747:5 sampler. An Aerosol Test Tunnel (ATT) was developed to evaluate the performance of the DustScan sampler. Atmospheric turbulence was simulated using a coarse grid generator and maintained as rough-wall channel flow by roughness elements fixed to its floor and roof of the ATT. A polydisperse test dust was introduced upwind to form a cloud at the sampler. DustScan directional dust gauges were repeatedly exposed to aliquots of test dust at wind speeds of 2-10ms -1 in the ATT. Dust soiling levels either side of the gauge's centreline (relative to the incident direction) were compared to demonstrate that the DustScan sampler is directionally accurate. Much lower proportions of antithetic sampling (dust catch on the downwind face of the gauge) occurred than for the BS 1747:5 sampler. The sampled particle size selection was related to the ratio of particle stop distance (s) to sampler diameter (D) ratio, s/D, showing that the particle size cut point fell with increasing wind speeds. A preliminary assessment of collection efficiency (CE) was made by determining dust mass after controlled ignition of selected sticky pad samples. Although dust saturation of the sticky pads can lead to sample loss over prolonged exposure periods, this loss is relatively small over the 1-2 week intervals established as appropriate for the DustScan sampler. This need for shorter sampling intervals is considered to outweigh the convenience of the longer exposure time but significantly poorer dust sampling characteristics of the BS 1747:5 sampler. © 2012 Elsevier Ltd.
Fowler M.,University of Portsmouth |
Datson H.,University of Leeds |
Datson H.,DustScan Ltd. |
Newberry J.,University of Gloucestershire
Journal of Environmental Monitoring | Year: 2010
The proportion of air pollution control (APC) residue in fugitive dust from the active cell of a hazardous waste landfill has been quantified using multi-element analytical data in combination with directional information about the dust samples collected. Passive sampling gauges (DustScan®) were deployed at the periphery of the cell, and samples were collected at fortnightly intervals. They were scanned for dust coverage and direction, and sub-samples were digested using HF and HNO3 prior to analysis for a range of metals using ICPAES. Dust samples were initially categorised on the basis of direction and distance with respect to the active cell, and overall colour. Independent graphical manipulation of the elemental data revealed separate dust populations with several demonstrably different inter-element ratios. These populations accord well with the initial dust characterisation, and consequent designation as "APC" and "background" has been confirmed by chemical comparison with grab samples from the active cell, the landfill clay and the topsoil cap. As well as allowing confident graphical discrimination between APC and background dusts, the technique provides datasets amenable to multivariate statistics. Principal component analysis followed by partial least-squares regression provides a rigorous way of investigating correlations within the data and predicting the explicable variance resulting from chosen end members. Element loadings on the first two components essentially confirm the results of the intuitive graphical approach. APC and clay/soil grab samples are successful signatures for PLS, for complementary sample groups. On the basis of both the intuitive and the statistical data handling, distinctive elemental ratios characteristic of APC and background dusts can be paired in order to define binary mixing trajectories, and thus quantify APC proportion in any individual sample. In one of the sampling intervals under consideration, some 65% APC was recorded close to the active cell margin, decreasing rapidly with dust fall out to 30% within a few hundred metres. This trial study indicates the potential of combining directional sampling with sensitive multi-element analysis to quantify fugitive dust from landfill and other facilities in the waste and industrial sectors. © 2010 The Royal Society of Chemistry.
Bruce J.,DustScan Ltd. |
Bruce J.,University of Portsmouth |
Fowler M.,University of Portsmouth |
Datson H.,DustScan Ltd.
Geoscience in South-West England | Year: 2013
An investigation was carried out into whether toxic elements at Devon Great Consols mine and mineral processing site are transferred into airborne dust particles. Deposited dust samples were collected across an area of approximately 15 hectares in the summer of 2011. Soil samples were also collected from within and near the former working areas. Dust sampling took place at locations up to 550 m from the former working areas. Samples were prepared for ICP-MS analysis by strong acid digestion. Crustal enrichment factors (EFs) were determined to compare concentrations in the samples with typical crustal values. EFs for arsenic and copper were very high and showed little significant difference between the soils and the dusts in the source area. EFs appear to reduce beyond the former mine workings. The soil appears to be a principal source for arsenic and copper in the dust particles. On the basis of comparison with findings elsewhere, it is possible that the UK target value for airborne arsenic could have been exceeded significantly. Given that the site is a current public open space, and that the bioavailability of these elements at this site has been recognised by others, there may be grounds for health risk concerns.
Agency: GTR | Branch: Innovate UK | Program: | Phase: Innovation Voucher | Award Amount: 5.00K | Year: 2015
Dustscan are applying for an Innovation Voucher to assist with the scientific validation of a new product. This product is a dust impact sampler that is used for collecting very small particles from ambient air. Validating the product will help to show that it works effectively. The new impact sampler is important because scientific evidence shows that these very small particles can be harmful to human health. We will sell our product to business e.g. those within the construction, waste and quarry sector, so that they can improve the environmental monitoring aspects of their operations. We would appoint British Geological Survey to conduct the tests required as an independent respected geoscience research institute in the UK. We would then seek to sell our product and the associated services to our clients which will allow our business to grow.