Optimization of stir bar sorptive extraction applied to the determination of odorous compounds in drinking water

A new passive sampling device was developed for field equilibrium sampling of geosmin (GSM) and 2-methylisoborneol (MIB) in surface water. The sampling device was prepared by coating a 50 cm length polypropylene hollow fiber tubing (50 mm wall thickness, 280 mm inner diameter) with polypropylene glycol 4000. The sampler was brought into equilibrium with the sample in the field, and then transferred and immersed into 100 mL of methanol held in a little desorption device for room temperature desorption and preservation of the sampled analytes. After being transported to the laboratory, the analytes were determined by headspace solid-phase microextraction-GC-MS. The large surface area-to-volume ratio of the developed sampler facilitated the reaching of sampling equilibrium in 1 h, while the equilibrium sampling minimized the effects of environmentally relevant sampling conditions. Variation of sample pH (4.0-9.0) and salinity (0-100 mM NaCl) had no significant effects on the distribution coefficients of analytes to the sampler. The desorption device, constructed with a 200 mL glass insert, and a 2 mL brown glass vial with PTFE sealed screw cap, has no loss of analytes during the storage of the sampler. The proposed procedure had detection limits of 4 and 9 ng L À1 for GSM and MIB, respectively. This developed sampler was successfully applied to field sampling in Taihu Lake (China), with MIB and GSM detected in the range of 0.11-0.61 mg L À1 during a medium out-break of blue-green algae bloom.

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“…, which were much higher in comparison to that reported in Lake Ontario (#0.056 mg L À1 ) 23 and in a reservoir in Taiwan (#0.200 mg L…”

contrasting

confidence: 56%

Development of polypropylene glycol coated hollow fiber membranes as passive sampler for field equilibrium sampling of odorous compounds in environmental waters

et al. 2011

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“…Toutefois, avec cette technique, des quantités plus élevées de polydiméthylsiloxane (PDMS) (entre 50 et 300 µL pour le SBSE contre 0,5 µL pour SPME) sont utilisées, ceci permet d'extraire des composés plus polaires (K o/e 1 10 à 500 pour SBSE et K o/e >10 000 pour SPME) (BENANOU et al, 2004). Des tiges agitatrices adsorbantes magnétiques enduites d'une couche d'une épaisseur de 1 mm de PDMS sont mises en contact avec un volume d'échantillon d'eau variant de 1 à 250 mL.…”

Section: Extraction Par Tige Agitatrice Adsorbante Et Analyse Par Cg/ Smunclassified

Les goûts et les odeurs dans l’eau potable : revue des composés responsables et des techniques de mesure

Proulx¹,

Rodriguez

Sérodes

2010

rseau

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L’évaluation de la qualité de l’eau potable d’un réseau de distribution est souvent faite en tenant compte des normes physico-chimiques et microbiologiques édictées par les réglementations nationales. L’approche par barrières multiples permet aussi d’assurer aux consommateurs une eau avec une sécurité sanitaire optimale. Cependant, malgré les sommes investies par les municipalités pour se conformer à ces normes, les consommateurs renoncent fréquemment à consommer l’eau du robinet.Ce refus peut être attribué, entre autres, à la qualité organoleptique (goût, odeur) de l’eau distribuée par les réseaux d’aqueduc. Toutefois, cet aspect est peu pris en compte par les législations actuelles et, conséquemment, est peu considéré par les gestionnaires des réseaux d’eau potable. De plus, les méthodes utilisées pour évaluer les molécules responsables des goûts et des odeurs de l’eau distribuée exigent de l’équipement spécialisé et coûteux. Cet article présente une revue de la problématique des composés responsables des goûts et des odeurs. Les aspects concernant les origines de ces composés, les méthodes quantitatives et qualitatives développées jusqu’à présent pour les analyser et la faisabilité d’application desdites méthodes, selon leurs avantages et leurs limites, seront abordés.The assessment of drinking water quality in a distribution system is generally based on physicochemical and microbiological standards set by government regulations. Although municipalities often invest considerable amounts to comply with regulations, an increasing proportion of citizens prefer alternatives to tap water. This situation may be in part explained by the organoleptic quality of distributed water in municipal systems and, in particular, by taste and odours. However, taste and odours are rarely considered as water quality criteria by municipal water managers. Moreover, analytical methods used to analyze molecules related to taste and odours in drinking water require specialized and costly equipment. This article presents the state of the art in terms of taste and odour issues in the drinking water area. The paper focuses on the origins of taste and odours and on the methods (qualitative and quantitative) available for the analysis of the compounds from which they originate. The feasibility of applying these methods to water quality surveillance is discussed, along with their advantages and drawbacks

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“…The odorous substances are mainly produced in the eutrophic water bodies, which are produced by algaes metabolism and their decomposition. The smell of earthy musty, is the most widely and unpleasant off-flavors in freshwater bodies, and Geosmin(GSM) is one of the main factors of water off-flavors [1]. Geosmin is a saturated cyclic tertiary alcohols, its olfactory threshold is very low (10ng/L).…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Degradation of Geosmin with Zn-Al Multi-metal Oxide Composites Derived from Layered Double Hydroxide Precursors

Hu¹,

Zhu²,

Zhang³

et al. 2017

dteees

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Abstract. Geosmin is one of the typical odor compounds in water environment, it has a very low odor threshold (10ng/L), and difficult to degrade in natural environment. In this study, a Zn-Al multi-metal oxide, based on Zn-Al-LDH as a precursor, was prepared and used as photocatalyst to investigate the photocatalytic degradation performance of geosmin in the range of ng level in aqueous solution. Firstly, Zn-Al-LDH was synthesized by co-precipitation method, and the Zn-Al multi-metal oxide was produced after calcination of Zn-Al-LDH at 1023 K in air. The obtained Zn-Al multi-metal oxide showed a good photocatalytic degradation performance. In the condition of simulated solar light, 1g/L catalyst dosage and initial geosmin concentration of 200ng/L, the apparent rate constant k app is 0.017min -1 . After 3 hours of photocatalytic reaction, the residual concentration of geosmin decreased to lower than 10ng/L, which can meet the requirements of "Standards for Drinking Water Quality" (GB5749-2006). The result showed that the photocatalytic reaction efficiency was mainly related with the part of ultraviolet light. The photocatalytic activity of the Zn-Al-MMO was little affected by pH over the range of 4-10. The possible photocatalytic degradation mechanism of the geosmin was also discussed.

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Optimization of stir bar sorptive extraction applied to the determination of odorous compounds in drinking water

Cited by 34 publications

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Development of polypropylene glycol coated hollow fiber membranes as passive sampler for field equilibrium sampling of odorous compounds in environmental waters

Development of polypropylene glycol coated hollow fiber membranes as passive sampler for field equilibrium sampling of odorous compounds in environmental waters

Les goûts et les odeurs dans l’eau potable : revue des composés responsables et des techniques de mesure

Photocatalytic Degradation of Geosmin with Zn-Al Multi-metal Oxide Composites Derived from Layered Double Hydroxide Precursors

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