Spectrophotometric determination of dissolved manganese in natural waters with 1-(2-pyridylazo)-2-naphthol: application to analysis in situ in hydrothermal plumes

Chin, Carol S.; Johnson, Kenneth S.; Coale, Kenneth H.

doi:10.1016/0304-4203(92)90057-h

Cited by 41 publications

(37 citation statements)

References 35 publications

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“…A 5 ml aliquot of the supernatant was analyzed spectrophotometrically at 560 nm with a Shimadzu UV-1601 spectrophotometer to estimate dissolved residual manganese. Dissolved manganese was estimated as described by Chin et al (1992). The method is sensitive over a concentration range of 300 nM-30 lM.…”

Section: Mn Immobilization Studymentioning

confidence: 99%

Manganese Oxidation by Bacterial Isolates from the Indian Ridge System

et al. 2005

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The abundance and activity of culturable manganese-oxidizing bacteria were assessed from near-bottom water samples of the tectonically active Carlsberg Ridge. Retrievable counts as colony forming units (CFU) on dilute nutrient agar medium (dilNA=2 gm l(-1) nutrient broth+2% agar) and on dilNA supplemented with 1, 2 and 3 mM MnCl(2).4H(2)O were in the order of 10(6) CFU l(-1). Retrievability of heterotrophs ranged from non-detectable levels (ND) to 2.82 x 10(6) CFU l(-1). The retrievable counts on Mn amended dilNA ranged from ND to 3.21 x 10(6), 1.47 x 10(6) and 1.45 x 10(6) CFU l(-1) on 1, 2 and 3 mM, respectively. About 87% of the Mn tolerant isolates (n=39) showed taxonomic affinities to Pseudomonas I and II sp. Two representative strains CR35 and CR48 (CR-Carlsberg Ridge) isolated on manganese-supplemented media were tested for their ability to tolerate a range of Mn amendments from 1 nM to 100 mM in terms of growth and respiration. CR35 represents 66% of the total CFU (3.04 x 10(6) CFU l(-1)), while CR48 represented only 6% of the total CFU (1.05 x 10(6) CFU l(-1)). The colonies of these two isolates were dark brown in color suggesting precipitation of Mn as oxide. Tests for the effect on growth and respiration were conducted in media simulating heterotrophic (amended with 0.01% glucose) and lithotrophic (unamended) conditions. Maximum stimulation in growth and respiration of CR35 occurred at 100 microM Mn both in unamended and amended media. At levels of Mn greater than 100 microM the counts decreased steadily. Total respiring cells of CR48 were stimulated to a maximum at 1 microM Mn in unamended medium and 1 nM in amended medium. Total cells counts for the same decreased beyond 100 microM Mn in unamended and 1 nM in amended medium. The isolates were tested for their ability to oxidize Mn amendments from 1 microM to 10 mM Mn. At the end of a 76-day incubation period, there was evidence of manganese oxide precipitation at high Mn concentrations (>or=1 mM) as a dark brown coloration on the sides of culture tubes. Highest Mn oxidation rates were observed at 10 mM Mn(II) concentration with CR35 oxidizing 27 and 25 microM Mn day(-1) in unamended and amended condition, respectively. CR48 oxidized Mn at the rate of 26 microM Mn day(-1) in unamended medium and 35 microM Mn day(-1) in amended medium. Scanning electron microscope (SEM) observations of both isolates revealed free-living cells in clustered matrices approximately 2 microm diameter. Energy dispersive spectrum of the cell matrix of CR35 cultured in 1 mM Mn detected 30% Mn, while the cell aggregates of CR48 harbored 7-10% Mn. The relatively high specific activity of these mixotrophic bacteria under relatively oligotrophic conditions suggests that they may be responsible for scavenging dissolved Mn from the Carlsberg Ridge waters and could potentially participate in oxidation.

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Section: Mn Immobilization Studymentioning

confidence: 99%

Manganese Oxidation by Bacterial Isolates from the Indian Ridge System

et al. 2005

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“…[48][49][50] Of these, colorimetry -in which the sample is mixed with an analyte-specific reagent to produce a measurable colour -has proved to be by far the most popular method and has been used for in situ analysis of a range of chemical parameters including nitrate and nitrite, [21,22,24,29,31,34,35,38] phosphate, [27,38] iron, [23,26,28,36,39,[42][43][44] manganese, [25,26,28,37,40] sulfide [32,33,35,39,41] silicate [30,32,33,38] and pH. [51][52][53][54][55] Colorimetry lends itself well to microfluidic in situ analysers as it is chemically robust, offers excellent analytical performance (limits of detection typically in the order of 10 nM [21,25,36]) and requires relatively small, cheap and easily-sourced components.…”

Section: In Situ Chemical Sensorsmentioning

confidence: 99%

“…Small sized peristaltic pumps are easily commercially sourced, relatively cheap and easy to M a n u s c r i p t use and consequently have proved consistently popular. [25,26,[28][29][30][32][33][34][35]37,[39][40][41][42][43] Nonetheless, peristaltic pumps can suffer from drifting flow rates due to variation in the elasticity and plasticity of the pump tubing with changes in temperatures [35] and, crucially, are relatively power hungry. [56] Consequently, reported deployments of peristaltic pumped sensors have been limited to a day or less, except where power could be externally supplied via cabling.…”

Section: Energy-efficient Sensorsmentioning

confidence: 99%

Trends in microfluidic systems for in situ chemical analysis of natural waters

Nightingale

Beaton

Mowlem

2015

Sensors and Actuators B: Chemical

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Spatially and temporally detailed measurement of ocean, river and lake chemistry is key to fully understanding the biogeochemical processes at work within them. To obtain these valuable data, miniaturised in situ chemical analysers have recently become an attractive alternative to traditional manual sampling, with microfluidic technology at the forefront of recent advances. In this short critical review we discuss the role, operation and application of in situ microfluidic analysers to measure biogeochemical parameters in natural waters. We describe recent technical developments, most notably how pumping technology has evolved to allow long-term deployments, and describe how they have been deployed in real-world situations to yield detailed, scientifically useful data. Finally, we discuss the technical challenges that still remain and the key obstacles that must be negotiated if these promising systems are to be widely adopted and used, for example, in large environmental sensor networks and on low-power underwater vehicles.

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“…The method of Chin et al (1992), while the most rapid and most suited of the techniques for in situ work, has a detection limit too high for work in the open ocean. The method of Chapin et al (199 l), while highly sensitive, uses chemiluminescent detection which adds extra cost to the system.…”

Section: Determination Of Dissolved Manganese In Seawater By Flow Injmentioning

confidence: 99%

“…Chapin et al (199 1) also described an FIA technique for Mn in seawater utilizing online Preconcentration but with chemiluminescent detection. For in situ analysis of dissolved Mn in hydrothermal plumes, Chin et al (1992) developed a rapid calorimetric method with a 20 nM detection limit.…”

Section: Determination Of Dissolved Manganese In Seawater By Flow Injmentioning

confidence: 99%

Determination of dissolved manganese in seawater by flow injection analysis with colorimetric detection

Mallini¹,

Shiller²

1993

Limnol. Oceanogr.

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A flow injection technique for the determination of dissolved Mn in seawater and other natural waters has been developed. The technique utilizes the Mn‐catalyzed oxidation of tiron by peroxide. The reaction product is determined colorimetrically. Sensitivity is enhanced and salt effects minimized through on‐line preconcentration of Mn. For a 3‐ml sample, a detection limit of 40 pmol kg−1 is possible. Use of a lab‐built colorimetric detector can provide an inexpensive alternative to a commercial flow‐through spectrophotometer.

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Spectrophotometric determination of dissolved manganese in natural waters with 1-(2-pyridylazo)-2-naphthol: application to analysis in situ in hydrothermal plumes

Cited by 41 publications

References 35 publications

Manganese Oxidation by Bacterial Isolates from the Indian Ridge System

Manganese Oxidation by Bacterial Isolates from the Indian Ridge System

Trends in microfluidic systems for in situ chemical analysis of natural waters

Determination of dissolved manganese in seawater by flow injection analysis with colorimetric detection

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