Method validation and determination of total iodine in seaweed bathwater
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Tarha Westby
Tarha Westby received her BSc in Forensic Investigation and Analysis from the Institute of Technology Sligo in 2011 and is currently carrying out her PhD in Analytical Chemistry. Her interests include marine and cosmetic chemistry.
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Geraldine Duignan
Geraldine Duignan lectures in pharmaceutical and health sciences at the Institute of Technology Sligo, Ireland. She holds an MSc in Pharmaceutical Analysis from the University of Strathclyde, Glasgow and has 8 years’ experience of analytical method development in the pharmaceutical industry including development of a chromatographic method for the European Pharmacopoeia. Geraldine also holds an MSc in Science Communication from Dublin City University. Her interests include analytical chemistry, pharmacognosy and science communication.
Thomas Smyth received his PhD in Pharmaceutical Biotechnology from Ulster University. After working for several years in Teagasc he is currently a lecturer at the Institute of Technology Sligo, Ireland. He has more than 6 years’ experience in the analysis of marine components and over 15 years’ experience in natural product chemistry. His interests are analytical chemistry, mass spectrometry, marine and terrestrial natural products, food chemistry and nutraceuticals.
Aodhmar Cadogan is a lecturer of Analytical Chemistry and Forensic Science at the Institute of Technology Sligo, Ireland. She received her PhD in Electrochemistry and Sensors from Dublin City University, Ireland. Following her PhD she spent some time in the area of Residue Analysis in Food. This was followed by 12 years of public sector and industrial experience in the areas of Forensic Science and the Diagnostic Device Industry. More recent research has concentrated on the chemical analysis of marine bathwater, seaweed and forensic materials.
Abstract
Seaweeds are a well-known natural source of iodine, although the quantity present varies depending on species, geographical location and season. Traditional seaweed baths contain hot water and seaweed but to date this bathwater matrix has not been studied. The objective of this study was to validate and apply the classical spectrophotometric Sandell-Kolthoff (SK) method for the analysis of total iodine in simulated seaweed bathwater. The principle of the method is based on the catalytic activity of iodide in the reduction of ceric ammonium sulphate being directly proportional to its concentration in the sample. Linear working range was from 30 μg l-1 to 300 μg l-1 iodine. The limit of detection (LOD) and limit of quantification (LOQ) were determined to be 9 μg l-1 and 29 μg l-1, respectively. The intra-assay repeatability indicated a mean coefficient of variation (CV) <2.5%. Inter-assay precision over 7 days indicated a CV of 6.7%. Recovery ranged from 87% to 114%. Addition of seaweed to simulated bathwater results in an increase in iodine which was found to be dependent on the length of contact time and on the temperature, with higher amounts released at longer immersion times and higher temperatures. The data confirms that traditional seaweed baths containing Fucus serratus stimulate the release of iodine into bathwater.
About the authors
Tarha Westby received her BSc in Forensic Investigation and Analysis from the Institute of Technology Sligo in 2011 and is currently carrying out her PhD in Analytical Chemistry. Her interests include marine and cosmetic chemistry.
Geraldine Duignan lectures in pharmaceutical and health sciences at the Institute of Technology Sligo, Ireland. She holds an MSc in Pharmaceutical Analysis from the University of Strathclyde, Glasgow and has 8 years’ experience of analytical method development in the pharmaceutical industry including development of a chromatographic method for the European Pharmacopoeia. Geraldine also holds an MSc in Science Communication from Dublin City University. Her interests include analytical chemistry, pharmacognosy and science communication.
Thomas Smyth received his PhD in Pharmaceutical Biotechnology from Ulster University. After working for several years in Teagasc he is currently a lecturer at the Institute of Technology Sligo, Ireland. He has more than 6 years’ experience in the analysis of marine components and over 15 years’ experience in natural product chemistry. His interests are analytical chemistry, mass spectrometry, marine and terrestrial natural products, food chemistry and nutraceuticals.
Aodhmar Cadogan is a lecturer of Analytical Chemistry and Forensic Science at the Institute of Technology Sligo, Ireland. She received her PhD in Electrochemistry and Sensors from Dublin City University, Ireland. Following her PhD she spent some time in the area of Residue Analysis in Food. This was followed by 12 years of public sector and industrial experience in the areas of Forensic Science and the Diagnostic Device Industry. More recent research has concentrated on the chemical analysis of marine bathwater, seaweed and forensic materials.
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Articles in the same Issue
- Frontmatter
- In this issue
- Research articles
- Genomic and phylogenetic analysis of Ceramium cimbricum (Ceramiales, Rhodophyta) from the Atlantic and Pacific Oceans supports the naming of a new invasive Pacific entity Ceramium sungminbooi sp. nov.
- A collections-based approach to the species and their distribution based on the bladed Bangiales (Rhodophyta) of Iceland
- Community structure of epiphytic diatoms on seaweeds in Northeastern Brazil
- Method validation and determination of total iodine in seaweed bathwater
- Proximate biochemical composition and mineral content of edible species from the genus Cystoseira in Portugal
- Assessment of the establishment success of eelgrass Zostera marina (Alismatales: Zosteraceae) from seeds in a cost-effective seed protection method: implications for large-scale restoration
- First evidence of Ostreopsis cf. ovata in the eastern tropical Pacific Ocean, Ecuadorian coast
- First evidence of the deep-sea fungus Oceanitis scuticella Kohlmeyer (Halosphaeriaceae, Ascomycota) from the Northern Hemisphere
- Short communication
- Spore dispersal in the intertidal kelp Lessonia spicata: macrochallenges for the harvested Lessonia species complex at microscales of space and time
Articles in the same Issue
- Frontmatter
- In this issue
- Research articles
- Genomic and phylogenetic analysis of Ceramium cimbricum (Ceramiales, Rhodophyta) from the Atlantic and Pacific Oceans supports the naming of a new invasive Pacific entity Ceramium sungminbooi sp. nov.
- A collections-based approach to the species and their distribution based on the bladed Bangiales (Rhodophyta) of Iceland
- Community structure of epiphytic diatoms on seaweeds in Northeastern Brazil
- Method validation and determination of total iodine in seaweed bathwater
- Proximate biochemical composition and mineral content of edible species from the genus Cystoseira in Portugal
- Assessment of the establishment success of eelgrass Zostera marina (Alismatales: Zosteraceae) from seeds in a cost-effective seed protection method: implications for large-scale restoration
- First evidence of Ostreopsis cf. ovata in the eastern tropical Pacific Ocean, Ecuadorian coast
- First evidence of the deep-sea fungus Oceanitis scuticella Kohlmeyer (Halosphaeriaceae, Ascomycota) from the Northern Hemisphere
- Short communication
- Spore dispersal in the intertidal kelp Lessonia spicata: macrochallenges for the harvested Lessonia species complex at microscales of space and time
