A1 Journal article – refereed
Assessment of metal ion concentration in water with structured feature selection




List of Authors: Naula P, Airola A, Pihlasalo S, Perez IM, Salakoski T, Pahikkala T
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Publication year: 2017
Journal: Chemosphere
Journal name in source: CHEMOSPHERE
Journal acronym: CHEMOSPHERE
Volume number: 185
Number of pages: 9
ISSN: 0045-6535

Abstract
We propose a cost-effective system for the determination of metal ion concentration in water, addressing a central issue in water resources management. The system combines novel luminometric label array technology with a machine learning algorithm that selects a minimal number of array reagents (modulators) and liquid sample dilutions, such that enable accurate quantification. The algorithm is able to identify the optimal modulators and sample dilutions leading to cost reductions since less manual labour and resources are needed. Inferring the ion detector involves a unique type of a structured feature selection problem, which we formalize in this paper. We propose a novel Cartesian greedy forward feature selection algorithm for solving the problem. The novel algorithm was evaluated in the concentration assessment of five metal ions and the performance was compared to two known feature selection approaches. The results demonstrate that the proposed system can assist in lowering the costs with minimal loss in accuracy. (c) 2017 Elsevier Ltd. All rights reserved.

Last updated on 2019-29-01 at 14:53