Bruce B. Johnson

La Trobe University

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Michael J. Angove

La Trobe University

John D. Wells

Film Independent

David W. Morton

La Trobe University

Maika Ruyter-Hooley

La Trobe University

Rodney G. Harris

La Trobe University

J. D. Wells

Walter Reed National Military Medical Center

Md. Aminul Islam

Dhaka Medical College and Hospital

K. M. Spark

University of Queensland

James R. Brandle

University of Nebraska–Lincoln

Suduan Gao

San Joaquin Valley Agricultural Sciences Center

Cooperative Institutions

La Trobe University

Bendigo Health

California Department of Pesticide Regulation

California Environmental Protection Agency

Commonwealth Scientific and Industrial Research Organisation

University of California, Davis

United States Department of Agriculture

University of Adelaide

San Joaquin Valley Agricultural Sciences Center

Agricultural Research Service

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Simulation of Fumigant Transport and Volatilization from Tarped Broadcast Applications

Vadose Zone Journal (2013)

Frank Spurlock Bruce B. Johnson Ataç Tuli Suduan Gao Jing Tao

We evaluated the ability of the HYDRUS 2D/3D model to simulate chloropicrin (CP) and 1,3‐dichloropropene (13D) fate, transport, and volatilization. Three fields with similar soil conditions were broadcast fumigated under a totally impermeable film (TIF). One field was used to calibrate HYDRUS by adjusting fumigant degradation rates, soil sorption coefficients, and TIF tarp resistance factors. In comparisons of simulated and measured soil gas concentrations, soil temperature, soil water contents, and inverse‐modeled estimates of fumigant volatilization flux, the model accurately simulated the basic individual processes of fumigant partitioning and degradation, heat transport, and soil water dynamics in the calibration field. Subsequent flux simulations of the remaining two fields were performed using only measured, independently estimated or calibrated inputs with no further adjustments. The magnitudes of simulated cumulative fluxes and both pre‐ and post‐tarpcut discrete flux densities were within the estimated range of uncertainty (factor of ∼2) of conventional inverse‐modeled field‐based flux estimates. However, the timing of maximum discrete flux densities was delayed by 1 to 2 d relative to inverse‐modeled estimates. While HYDRUS provided reasonably accurate flux estimates, it was also evident that parameterization, particularly for TIF tarp permeability properties, generally requires field‐based calibration because of a lack of representative field effective permeability data.

Volatilisation

10.2136/vzj2013.03.0056

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Citations (10)

Characterization of carbonaceous combustion residues. I. Morphological, elemental and spectroscopic features

Chemosphere (2003)

Milena Fernandes J. O. Skjemstad Bruce B. Johnson John D. Wells Peter Brooks

Magic angle spinning

Carbon fibers

10.1016/s0045-6535(03)00098-5

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Citations (175)

The adsorption of myo-inositol hexaphosphate onto kaolinite and its effect on cadmium retention

Applied Clay Science (2016)

Maika Ruyter-Hooley Bruce B. Johnson David W. Morton Michael J. Angove

Ternary complex

10.1016/j.clay.2016.10.023

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Citations (22)

Evaluation of Weather Conditions for Methyl Bromide Ambient Air Monitoring in Monterey, Santa Cruz, and Kern Counties in the Year 2000

Journal of the Air & Waste Management Association (2006)

LinYing Li Bruce B. Johnson Randy Segawa

Weather condition is one of the most important factors affecting spatial and temporal distributions of air pollutants, especially for short-term air dispersion. Abnormal weather conditions might lead to higher or lower ambient air concentrations than they would be under normal weather conditions. Therefore, testing for normality of weather conditions during the air monitoring period is an essential step for evaluating ambient air monitoring results. In this paper, a distance method was used to select a most representative weather station from the available candidates. An array of meteorological elements were identified that affect air dispersion and transportation. A statistical method was used to determine whether the weather conditions during the air monitoring period were significantly different from that of previous years. Using methyl bromide ambient air monitoring as a case study, this paper documents the methods, procedures, and results of weather analysis for Monterey, Santa Cruz, and Kern Counties during ambient air monitoring periods for methyl bromide in the year 2000. With a few exceptions, the meteorological elements and atmospheric stability factors, such as wind speeds, wind directions, and stability classes, during the monitoring period were in the normal range. Although there were higher frequencies of stable atmospheric conditions in Monterey/Santa Cruz Counties than in Kern County, weather conditions during the monitoring period were not significantly different from normal local weather conditions of previous years. Consequently, the subchronic air concentrations observed during the ambient air monitoring periods for methyl bromide in the year 2000 was taken under typical weather conditions of those areas at that time of the year.

Air monitoring

Weather station

Atmospheric instability

10.1080/10473289.2006.10464435

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Citations (1)

Sorption of 3-amino-1,2,4-triazole and Zn(II) onto montmorillonite

Clays and Clay Minerals (2005)

Jaslin Ikhsan John D. Wells Bruce B. Johnson Michael J. Angove

Cationic polymerization

10.1346/ccmn.2005.0530203

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Citations (8)

The adsorption of nortriptyline on montmorillonite, kaolinite and gibbsite

Applied Clay Science (2018)

Shahrzad Sadri Bruce B. Johnson Maika Ruyter-Hooley Michael J. Angove

Gibbsite

Attenuated total reflection

10.1016/j.clay.2018.08.005

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Citations (37)

Characterizing heavy‐metal adsorption on oxides and oxyhydroxides

European Journal of Soil Science (1995)

K. M. Spark Bruce B. Johnson J. D. Wells

Summary Adsorption of Cu(II), Zn(II), Co(II) and Cd(II) on three different substrates: goethite, alumina and silica, was investigated over the pH range from 3.5 to 10. The consistent variation in the pH at which 50% of the metal is adsorbed (pH 50 ) indicates that the identity of the adsorbing ion is the principal factor determining the pH range over which adsorption occurs. However, the nature of the substrate does play a lesser role. The proton coefficient, χ, ranged from about 0.5 to 1.8, and was correlated with the difference between pH 50 and the pH for 50% precipitation. It is suggested that for most metal‐substrate systems, for which χ is about 1, MOH + plays a dominant role in adsorption. Increasing the substrate concentration decreased pH 50 for adsorption of metals on goethite, but there was little change in χ. The change in pH 50 was inversely related to χ. While the effect of the nature and concentration of the background electrolyte on Cu(II), Zn(II) and Co(II) adsorption depended on the substrate, increased ionic strength was found to decrease Cd(II) adsorption on all substrates.

10.1111/j.1365-2389.1995.tb01358.x

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Citations (149)

Adsorption of humic and fulvic acids onto a range of adsorbents in aqueous systems, and their effect on the adsorption of other species: A review

Separation and Purification Technology (2020)

Md. Aminul Islam David W. Morton Bruce B. Johnson Michael J. Angove

10.1016/j.seppur.2020.116949

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Citations (155)

Competitive adsorption of Cd and dyes to kaolinite

Clays and Clay Minerals (2006)

Rodney G. Harris Bruce B. Johnson John D. Wells