Date of Award


Degree Type


Degree Name

Master of Science in Chemistry



First Advisor

James L. Fasching


Arsenic(III) and arsenic(V) species exist in sea water at concentration levels of less than 0.2 ng/ml to greater than 50 ng/ml. The concentration levels of these species in sea water are currently questionable due mostly to possible interferences.

A reliable analytical method has been developed to separate and determine these species in sea water. The method involves the extraction of APDC-As(III) complex into a chloroform layer at a pH range of 4.0- 4.5. Wet ashing of the chloroform layer followed by reduction of arsenic(V) to arsenic(III) by potassium iodide makes it possible to determine arsenic by the atomic absorption spectrometry-hydride generation technique. The various parameters such as pH, percent APDC, interferences, efficient reducing agents and wet ashing methods have been investigated in this study.

A detection limit of 0.031 ppb and a sensitivity of 0.140 ng/ml have been achieved. Precision as judged by % RSD (0.6-5.4) indicates good reproducibility of the results when synthetic sea water samples spiked with arsenic(III) and natural sea water samples are analyzed.



To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.