SEGH Articles

In Memoriam: Willard R Chappell PhD

24 November 2017
With great sadness we have learned of the death of Willard (Bill) Chappell on October 7, 2017.

In Memoriam

Willard R Chappell PhD

With great sadness we have learned of the death of Willard (Bill) Chappell  on October 7, 2017.

Bill was Professor (subsequently Professor Emeritus) of Physics and Preventive Medicine at the University of Colorado Denver (USA). Bill joined our society in 1988 and was elected Secretary/Treasurer for 1989 through 1991. He served on the Board from 1992 to 2004 in a special position as Task Force Chairman of the SEGH Arsenic Task Force.  The work of the Task Force led to the Arsenic Exposure and Health Problems conferences  in 1993, 1995, 1998, 2000 and 2002. In addition to the  conference proceedings three books (Arsenic Exposure and Health Effects, edited by Willard Chappell, Charles Abernathy and Rebecca Calderon) were published. These publications were very well received by the international research community and influenced the setting of drinking water standards for arsenic. In 2005 Bill Chappell's efforts were recognized by the (SEGH) Julian J. Chisolm, Jr. Award for Outstanding Leadership in Environmental  Geochemistry and Health.

In his academic life Bill, in addition to his activities as an educator and researcher,  was Chairman of the State of Colorado Governors Scientific Advisory Committee in 1974-1975 and Chairman of the United State Department of Energy Oil Shale Task Force from 1978-1982.  In the academic year 1983/1984 he had a sabbatical leave in England as Academic Visitor in London University's Imperial College.

Bill's father and mother Will and Mildred preceded him in death.  Bill is survived by two brothers, Robert Bruce Chappell and John Heizer.  Bill's wife Juanita Benetin, whom he married on March 5, 1981 their two children Ginger Ferguson and her Husband, Robert Snook, and Robert Lincoln Ferguson, Jr.

Those of us who were privileged to know him  remember him not only for his active leadership in our society but also for him as a person, as good company, as fun. He was best described as a bon viveur, amply living up to the dictionary definition as a person who likes going to parties and who enjoys good food and wine. He was reputed to know the best restaurants in cities throughout the world.

Brian E Davies and Bobby G Wixson (Past Presidents)

 

Keep up to date

SEGH Events

Submit Content

Members can keep in touch with their colleagues through short news and events articles of interest to the SEGH community.

Science in the News

Latest on-line papers from the SEGH journal: Environmental Geochemistry and Health

  • Distribution pattern and health risk assessment of polycyclic aromatic hydrocarbons in the water and sediment of Algoa Bay, South Africa 2018-11-11

    Abstract

    Polycyclic aromatic hydrocarbons are amongst the pollutants of major concern in the terrestrial and aquatic habitats. They are mostly characterised by carcinogenic and non-carcinogenic effects. Distribution and potential health risks of sixteen priority PAHs in the water and sediment samples collected between December 2015 and June 2016 from Algoa Bay, South Africa, were evaluated. Water and sediment samples collected were extracted with liquid–liquid and soxhlet extraction methods, respectively, and then cleaned up using glass column loaded with silica gel. Final concentrations of the target PAHs were determined by gas chromatography interfaced with flame ionization detector. Results indicated that individual PAH concentrations in surface water, bottom water and sediment samples ranged from not detected (ND) to 24.66 µg/L, ND to 22.81 µg/L and ND to 5.23 mg/kg correspondingly. Total PAHs concentrations varied as 12.78–78.94 µg/L, 1.20–90.51 µg/L and 1.17–10.47 mg/kg in the three environmental matrices in that order. The non-carcinogenic risk was generally below 1, whereas risk indices (dermal contact) were above the acceptable limit of 1 × 10−4 in the water column, suggesting possible carcinogenic effects to humans, with adults being the most vulnerable. Similarly, highest contributions to TEQs and MEQs in the sediments were made by benzo(a)pyrene and dibenzo(a,h)anthracene, the two most toxic congeners, signifying the possibility of carcinogenicity and mutagenicity in humans. Diagnostic ratios of PAHs reflect a prevailing pyrogenic input all through. The pollution was albeit moderate, yet regular check is recommended to ensure safe and healthy environment for human and aquatic lives.

  • Potential exposure to metals and health risks of metal intake from Tieguanyin tea production in Anxi, China 2018-11-10

    Abstract

    The metal content of Tieguanyin tea from Anxi, Southeast China, was studied. Leaching experiments were designed based on the local tea-drinking habits, and tea infusions were prepared using three types of water and two methods of soaking tea. Twelve metals (Cd, As, Cr, Pb, Se, Sb, Ag, Tl, Cu, Zn, Be, and Ba) were measured by inductively coupled plasma mass spectrometry (ICP-MS), and a human health risk assessment was performed. The results showed that the quality of water used for steeping tea has a direct effect on the leaching concentrations of metals in the tea infusion and this effect can be reduced by using pure water or commercially available drinking water. Further, the two tea-soaking methods used by local residents can reduce the metal intake. The health risk assessment determined that the carcinogenic risk values of Cr, As, and Pb (Cr > Pb > As) were within an acceptable range (10−7–10−4); therefore, the concentrations of these metals in tea infusions do not pose substantial carcinogenic risk to tea drinkers. The results also indicate that the high concentrations of Tl in the tea infusions pose a substantial noncarcinogenic risk and may result from the dissolution characteristics of Tl and the water quality.

  • Health risk assessment and source apportionment of polycyclic aromatic hydrocarbons associated with PM 10 and road deposited dust in Ahvaz metropolis of Iran 2018-11-09

    Abstract

    The objective of this study was to compare the characteristics of polycyclic aromatic hydrocarbons (PAHs) in PM10 and road dust samples, as well as to identify and quantify the contributions of each source profile using the positive matrix factorization (PMF) receptor model. Health risk assessment was carried out using toxic equivalency factors and incremental lifetime cancer risk (ILCR), which quantitatively estimate the exposure risk for age-specific groups. PM10 samples were collected on PTFE filters in the metropolitan area of Ahvaz. Road dust samples were also collected from all over the urban areas with different land uses. Total PAH concentrations in PM10 and road dust samples were 0.5–25.5 ng/m3 and 49.3–16,645 µg/kg, respectively. Pyrene was the highest PAH in the PM10 profile, whereas fluoranthene became the highest PAH in the road dust. Abundance of benzo[ghi]perylene at PM10 and road dust samples suggested a source indicator for traffic emissions. The results demonstrate that in 36.5% of samples, PM10 concentrations exceed the maximum concentration level recommended by EPA. A multiple linear regression model was used to estimate the influence of meteorological parameters (temperature, wind speed, and relative humidity) on buildup of PAHs. All of PAH species show higher concentrations during the cold and typical days rather than the dust event days and warm periods. PMF analysis showed that vehicular emissions (50.6%) and industrial activities (especially steel industries) (30.4%) were first two sources of PAHs bounded with PM10, followed by diesel emissions (11.6%) and air–soil exchange (7.4%). For road dust samples, three common sources were also identified: vehicular traffic (48%), industrial activities (42.3%), and petrogenic sources (9.7%), in line with that of diagnostic molecular ratios results. According to the results of health risk assessment model, the ILCR of exposure to PAHs associated with PM10 and road-deposited dust was higher than the guidelines of USEPA, indicating high carcinogenic risk.