BUKU ABSTRAK - Universiti Putra Malaysia

Science, Technology & Engineering
Classification Problem for PDE(S) with Variable Coefficients
Prof. Dr. Adem Kilicman
Hassan Eltayeb
Institute of Mathematical Research, University Putra Malaysia,
43400 UPM Serdang, Selangor, Malaysia.
+603-8946 6813; akilicman@putra.upm.edu.my
The classification of partial differential equations is an historical problem and it is difficult to make
classification on PDEs with variables coefficients. In this study we consider further analysis on the classifications
problem of linear second order partial differential equations with non-constant coefficients. The equations are
produced by using the convolution with odd or even functions. It is shown that the classifications of new equations
are similar to the classification of original equations.
Keywords: Classifications of PDEs, even and odd functions, convolution operators, classification of PDEs with variables
coefficients
A Novel Chrome (VI) PVC Sensor based on Complex Ionophore for Industrial
Wastes
Prof. Dr. Anuar Kassim
Majid Rezayi, Anuar Kassim, Saeid Ahmadzadeh, Tan Wee Tee, Nor Azah Yusof and Lee Yook Heng
Faculty of Science, University Putra Malaysia,
43400 UPM Serdang, Selangor, Malaysia.
+603-8946 6779; anuar@science.upm.edu.my
Chromium is present in effluent discharged from tannery, electroplating, chemical industries, etc. Its
determination and removal from effluents have been a serious environmental concern owing to its high toxicity.
In this work a membrane was prepared with the use of N,N Bis(salicylidene) ethylenediamino cobalt(II) hydrate
(Co(SALEN)2) as an ion carrier (ionophore), polyvinylchloride (PVC) as matrix, and 2-nitrophenyl octyl ether
(2NPOE), as plasticiser for making an ion selective electrode for measurement of CrO42- anion in solutions.
The amounts of (Co(SALEN)2) and PVC were optimised in the preparation of the membrane. The response of
the electrode was Nernstian within the concentration range 1.0 × 10-6 to 1.0 × 10-1 M of CrO42-. This sensor
displays a drift in Nernstian response for this anion with increasing and decreasing amount of ionophore and PVC
respectively. The effects of various parameters such as pH, different anion interferences, effect of the amounts
of ionophore, PVC and time on response of the coated ion selective electrode were investigated. The response
of the fabricated electrode at concentration range from 1.0× 10-6 to 1.0× 10-1 M is linear with a Nernstian slope
of -28.33 mV per decade. The strengths of the ion-ionophore (CrO42- - Co(SALEN)2) interactions and the roles
of ionophore on membrane are also studied via UV-Visible, FTIR and scanning electron microscopy (SEM).
Quantification of Cr(VI) in industrial samples like as electroplating waste potable and industrial waste waters
were successfully achieved using the sensor.
Keywords: Ion-selective electrode, chromate (II) anion, N,N Bis(salicylidene) ethylenediamino cobalt(II) hydrate, scanning
electron microscopy (SEM), electroplating waste, potable and industrial waste waters
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