scholarly journals Addressing the environmental and health impacts of microplastics requires open collaboration between diverse sectors

PLoS Biology ◽  
2021 ◽  
Vol 19 (3) ◽  
pp. e3000932
Author(s):  
Scott Coffin ◽  
Holly Wyer ◽  
J. C. Leapman
Keyword(s):  
Emerging Contaminants ◽  
Chemical Properties ◽  
Health Impacts ◽  
Public Concern ◽  
Open Collaboration ◽  
Regulatory Frameworks ◽  
Polyfluoroalkyl Substances ◽  
Protective Regulations ◽  
And Chemical Properties

Public concern over the environmental and public health impacts of the emerging contaminant class “microplastics” has recently prompted government agencies to consider mitigation efforts. Microplastics do not easily fit within traditional risk-based regulatory frameworks because their persistence and extreme diversity (of size, shape, and chemical properties associated with sorbed chemicals) result in high levels of uncertainty in hazard and exposure estimates. Due to these serious complexities, addressing microplastics’ impacts requires open collaboration between scientists, regulators, and policymakers. Here we describe ongoing international mitigation efforts, with California as a case study, and draw lessons from a similarly diverse and environmentally persistent class of emerging contaminants (per- and polyfluoroalkyl substances) that is already disrupting traditional regulatory paradigms, discuss strategies to address challenges associated with developing health-protective regulations and policies related to microplastics, and suggest ways to maximize impacts of research.

Physical and Chemical Properties of Mineral in Soils of Cassava Cropping Area: A Case Study in Chonburi Province

2014 ◽  
Vol 979 ◽  
pp. 440-443
Author(s):  
W. Siriprom ◽  
K. Teanchai ◽  
S. Kongsriprapan ◽  
J. Kaewkhao ◽  
N. Sangwaranatee
Keyword(s):  
Thermo Gravimetric Analysis ◽  
Chemical Properties ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
X Ray ◽  
Physical And Chemical ◽  
And Chemical Properties

The chemical and physical properties of topsoil and subsoil which collected from the cassava cropping area in Chonburi Province have been investigated. The characterization of both soil sample were used X-Ray Diffraction (XRD), Energy Dispersive X-Ray Fluorescence (EDXRF) while FTIR used to confirmed the formation of intermolecular bonding and Thermo-Gravimetric Analysis (TGA) used for investigated the crystalline. It was found that, the XRD pattern indicated quartz phase. The chemical composition by XRF reported that the soils samples consist of Si, Al, Ca, Fe, K, Mn, Ti, Cr, Zn, Ag and Cu. and TGA results, noticed that the removal of moisture and organics material.

SENSITIVITY ANALYSIS IN OIL SPILL MODELS: CASE STUDY USING ADIOS

1995 ◽  
Vol 1995 (1) ◽  
pp. 898-900 ◽  
Author(s):  
Roy Overstreet ◽  
Andrzej Lewandowski ◽  
William Lehr ◽  
Robert Jones ◽  
Debra Simecek-Beatty ◽  
...  
Keyword(s):  
Sensitivity Analysis ◽  
Oil Spill ◽  
Oil Spills ◽  
Chemical Properties ◽  
First Order ◽  
Mass Losses ◽  
Data Inquiry ◽  
Physical And Chemical ◽  
And Chemical Properties

ABSTRACT The Hazardous Material Response and Assessment Division (HAZMAT) at the National Oceanic and Atmospheric Administration uses the oil weathering software package named Automated Data Inquiry for Oil Spills (ADIOS) to investigate the oil weathering process. This model combines a database of physical and chemical properties of oils with a simulation model computing mass losses, density, viscosity, and water content of an oil spill due to evaporation, dispersion, and emulsification. A first-order sensitivity analysis of the ADIOS evaporation algorithm indicates that it might be possible to provide a taxonomy of oils with respect to the reliability of results generated by the model.

scholarly journals A <i>synthetic</i> ice core approach to estimate ion relocation in an ice field site experiencing periodical melt; a case study on Lomonosovfonna, Svalbard

2015 ◽  
Vol 9 (5) ◽  
pp. 5053-5095
Author(s):  
C. P. Vega ◽  
V. A. Pohjola ◽  
E. Beaudon ◽  
B. Claremar ◽  
W. J. J. van Pelt ◽  
...  
Keyword(s):  
Ice Core ◽  
Chemical Properties ◽  
Ice Cores ◽  
Field Site ◽  
Ice Field ◽  
Physical Stratigraphy ◽  
Physical And Chemical ◽  
Annual Resolution ◽  
And Chemical Properties

Abstract. Physical and chemical properties of four different ice cores (LF-97, LF-08, LF-09 and LF-11) drilled at Lomonosovfonna, Svalbard, were compared to investigate the effects of meltwater percolation on the chemical and physical stratigraphy of these records. A synthetic ice core approach was employed as reference record to estimate the ionic relocation and meltwater percolation length at this site during the period 2007–2010. Using this method, the ion elution sequence obtained for Lomonosovfonna was SO42- > NO3- > NH4+ > Mg2+ > Cl-, K+ > Na+ > Ca2+, with acidic ions being the most mobile within the snowpack. The relocation length of most of the ions was in the order of 1 m, with the exception of SO42- showing relocation lengths > 2 m during this period. In addition, by using both a positive degree day (PDD) and a snow-energy model approaches to estimate the percentage of melt at Lomonosovfonna, we have calculated a melt percentage (MP) of the total annual accumulation within the range between 48 and 70 %, for the period between 2007 and 2010 which is above the MP range suggested by the ion relocation evidenced in the LF-syn core (i.e. MP = 30 %). Using a firn-densification model to constrain the melt range, a MP of 30 % was found over the same period which is consistent with the results of the synthetic ice core approach, and a 45 % of melt for the last 60 years. Considering the ionic relocation lengths and annual melt percentages, we estimate that the atmospheric ionic signal remains preserved in recently drilled Lomonosovfonna ice cores at an annual or bi-annual resolution.

scholarly journals Effect of Pruning Intensities on the Performance of Fruit Plants under Mid-Hill Condition of Eastern Himalayas: Case Study on Guava

2015 ◽  
Vol 46 ◽  
pp. 46-51 ◽  
Author(s):  
Rupankar Bhagawati ◽  
Kaushik Bhagawati ◽  
Vijay Kumar Choudhary ◽  
Deep Jyoti Rajkhowa ◽  
Rupjyoti Sharma
Keyword(s):  
Chemical Properties ◽  
Fruit Yield ◽  
Soluble Solids ◽  
Eastern Himalaya ◽  
Stressed Condition ◽  
Eastern Himalayas ◽  
Yield And Quality ◽  
Physical And Chemical ◽  
And Chemical Properties

Current study was undertaken to highlight the effect of pruning on improving vigor of old orchards and increasing performance in terms of fruit yield and quality under water and nutrient stressed condition of mid hills of Eastern Himalaya. Guava was taken for the case study and all the physical and chemical properties of the fruits and other attributes of plant were evaluated using standard methods under three pruning intensities (light, moderate and severe) and no pruning. The emergence of bud was earliest in severe pruning, number of buds per shoot was highest with light pruning and cumulative lengths of new shoots were found to be highest in severe pruning. Fruit yield, size and weight were found to increase with pruning intensities and lowest in case of no pruning. Regarding chemical properties, total soluble solids and total sugar found to increase with enhanced pruning severity and least in case of no pruning. Acidity was found to be highest with no pruning and decrease with increase in pruning intensities. Overall pruning found to have rejuvenating impact on aged trees due to better light interception leading to better photosynthetic rate, better nutrient and water supply with reduced canopy and better quality yields.

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