Ontario Ministry of Transportation

About: Ontario Ministry of Transportation is a government organization based out in Toronto, Ontario, Canada. It is known for research contribution in the topics: Poison control & Asphalt. The organization has 4652 authors who have published 3882 publications receiving 59011 citations.

Simultaneous Multielement Determination of Trace Metals in Seawater by Inductively Coupled Plasma Atomic Emission Spectrometry Using Chelating Resin Column Preconcentration

Abstract: Preconcentration of trace metals in seawater using a Chelex-100 resin column was investigated for simultaneous determination by inductively coupled plasma atomic emission spectrometry (ICP-AES). The optimum preconcentration conditions were examined in detail. With 100 ml of 1 M ammonium acetate buffer solution (1 M=1 mol dm−3), the matrix elements in seawater could be removed sufficiently without loss of analytes. The concentration factor of 200 times could be achieved by dissolving the dried HNO3 eluent of the column. The blanks of the method were negligibly small for most elements investigated. The detection limits were in the range of several ng/1 to 100 ng/1 for Al, Cd, Co, Cr, Cu, Fe, Mn, Mo, Ni, Pb, Ti, V, and Zn. The present technique was applied to the determination of trace metals in coastal and ocean seawater.

Drainage under increasing and changing requirements

Abstract: This year the Working Group on Drainage of the International Commission on Irrigation and Drainage (ICID) celebrates its 25th anniversary. This paper reviews the development of drainage for three different agro-climatic zones, i.e. the temperate (humid), the arid/semi-arid and the humid/semi-humid zones. Drainage is referred to as crop-season drainage, off-season drainage, intermediate drainage and salt drainage. Its specific properties, requirements, socio-economic functions and environmental implications are considered. Global statistics on the areas with and without irrigation and drainage are presented as well as the outlook of anticipated drainage developments in the future. The role of drainage in global food production is illustrated. Drainage design criteria over these last 25 years have evolved from the dual objectives of draining waterlogged agricultural lands and controlling soil salinity, to multi-criteria objectives that include the original criteria, satisfying more stringent environmental and water quality criteria, involve multi-stakeholder participation and social benefits, and satisfy economic criteria. Interaction with urban drainage and flood protection has also become an essential part in design considerations. Most importantly the designs need to be sustainable. This article briefly describes the evolution of these various aspects over the last 25 years

Modelling transport in interaction with the economy

Abstract: This article presents a dynamic, interregional model about the economy, transport, infrastructure and other regional features. Its main characteristic is the interaction between transport and economy. In this respect the model differs from other transport models, where mostly either the economy influences transport or transport influences the economy. The simulation of time paths, the use of statistical data and the estimation of the coefficients of the model are explained. The model has been applied to the 40 regions of the Netherlands, resulting in long-term simulations of transport and economy on the basis of some policy scenarios.