The McLane WTS-LV: a large volume, high accuracy, oceanographic sampling pump

Morrison, A.T.; Billings, John D.; Doherty, Kevin

doi:10.1109/oceans.2000.881365

Cited by 8 publications

(3 citation statements)

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“…Bishop et al (1986) reported this effect to be small, although some large particles are found on MULVFS blank prefilters; such particles likely arrive during the initial deployment of the pump when surface water floods the filters than upon recovery since typical flow meter values for blank filters are several liters compared with thousands. Water intake for holder B is through large radial openings that feed the flow down through a 2.5 cm long honeycomb baffle made of titanium in the standard model (B1) (Morrison et al 2000), and plastic in the tracemetal model (B2). This baffle is designed to straighten the flow and suppress turbulence, and distribute particles evenly across the filter.…”

Section: Filter Holder Descriptionsmentioning

confidence: 99%

Getting good particles: Accurate sampling of particles by large volume in‐situ filtration

Bishop

Lam

Wood

2012

Limnology & Ocean Methods

113

147

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We deployed the Multiple Unit Large Volume in‐situ Filtration System (MULVFS) to simultaneously sample 12 depths between 10 and 900 m during the US GEOTRACES Atlantic and Pacific intercalibration experiments. Sampling was designed to simultaneously compare large (>51 µm) and small (micron or sub‐micron to 51 µm) size particulates collected by four classes of 142 mm filter holders against those collected using the main MULVFS filter holder. We evaluated Whatman “QMA,” Pall “Supor” (0.8, 0.45, 0.2 µm), and Millipore “MF” (0.45 µm) filters. Paired QMA filters had best particle loading and uniformity and sample particles to 0.8 µm. Paired 0.8 µm Supor filters sample particles to 0.45 µm and provide the best compromise in terms of sample loading and evenness of particle distribution for elements that require total sample digestion. We also found, under the most benign oceanographic conditions, that many 142 mm single and double baffle filter holders lost of up to 90% of the large particle size fraction, especially in the upper 150 m. We designed and validated a new 142 mm filter holder that solves this problem. We further studied the effect of filtration flow rate on large particle size distribution and chemistry; samples from 500‐800 m in the oligotrophic Pacific showed a 50% decrease of > 51 µm Mn, Ba, and Ca (but no effect on P) over a flow velocity range of 0.1 to 1.6 cm s−1. We recommend sampling below 1 cm s−1. The methodology of bottle and in‐situ filtration is also discussed.

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Section: Filter Holder Descriptionsmentioning

confidence: 99%

Getting good particles: Accurate sampling of particles by large volume in‐situ filtration

Bishop

Lam

Wood

2012

Limnology & Ocean Methods

113

147

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“…To obtain a sample, water is drawn through each flow path sequentially by the pump, which is located downstream of the filtering head. The filtering head is interfaced with McLane Water Transfer System components: a 25 position actuator (24 sample ports and 1 dedicated purging port), a mechanical flow-meter, 5000 m (5500 m ROV version) pressure housing, a micro-controller (Onset Computer Corporation TT8 TM ), and an adaptation of McLane control software (Morrison et al, 2000). The software uses active feedback to reduce pumping speeds as the filters become loaded with sample and will stop collecting a sample when pump revolutions per minute drop below an operator-controlled threshold (pre-set for autonomous deployments but real-time for ROV deployments).…”

Section: Descriptionmentioning

confidence: 99%

A suspended-particle rosette multi-sampler for discrete biogeochemical sampling in low-particle-density waters

Breier

Rauch

McCartney

et al. 2009

Deep Sea Research Part I: Oceanographic Research Papers

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a b s t r a c tTo enable detailed investigations of early stage hydrothermal plume formation and abiotic and biotic plume processes we developed a new oceanographic tool. The Suspended Particulate Rosette sampling system has been designed to collect geochemical and microbial samples from the rising portion of deep-sea hydrothermal plumes. It can be deployed on a remotely operated vehicle for sampling rising plumes, on a wire-deployed water rosette for spatially discrete sampling of non-buoyant hydrothermal plumes, or on a fixed mooring in a hydrothermal vent field for time series sampling. It has performed successfully during both its first mooring deployment at the East Pacific Rise and its first remotely-operated vehicle deployments along the Mid-Atlantic Ridge. It is currently capable of rapidly filtering 24 discrete large-watervolume samples (30-100 L per sample) for suspended particles during a single deployment (e.g. 490 L per sample at 4-7 L per minute through 1 mm pore diameter polycarbonate filters). The Suspended Particulate Rosette sampler has been designed with a long-term goal of seafloor observatory deployments, where it can be used to collect samples in response to tectonic or other events. It is compatible with in situ optical sensors, such as laser Raman or visible reflectance spectroscopy systems, enabling in situ particle analysis immediately after sample collection and before the particles alter or degrade.

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“…1) collect as many as 24 discrete samples per deployment, 2) filter 30 to 100 liters per sample onto 1.2 Fim filters (37 mm diameter) in <15 minutes time, 3) collect the samples in a manner that ensures sample integrity, trace metal cleanliness, and in situ optical sensor compatibility, 4) be capable of measuring and recording individual sample filtered water volumes, 5) be capable of preprogrammed and manually triggered sample collection, 6) and be rated to a depth of .5000 m. These requirements were met by designing our own novel multi-sample filtering head and mating it to components of a Mclane Research Laboratories Inc. (Mclane) valve stepper motor and in situ pumping system [5]. The number of samples (24) was chosen to match a common complement of Niskin bottles on a CTD water carousel.…”

Section: Design Requirements and Alternativesmentioning

confidence: 99%

A Suspended Particle Rosette Sampler for Investigating Hydrothermal Plumes

2007

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We have developed and are building a new oceanographic tool, a SUspended Particulate Rosette (SUPR) sampling system. The SUPR sampler is capable of rapidly filtering 25 large water volume samples (30 to 100 liters per sample) for suspended particulates during a single deployment. In addition, the SUPR sampler is designed to be compatible with in situ optical analysis methods. We are developing the SUPR sampler to investigate these fundamental questions, "How do ironand manganese-rich, hydrothermal plume particles affect seawater chemistry and to what extent do these paiticles fuel microbial activity in deep-sea hydrothermalplumes?" While past studies have determined the average chemical composition of hydrothermal plumes we lack the detailed information we need to understand the complete formation process and to what extent plume particle chemistry is modified by reactions with seawater and chemosynthetic organisms. Key to answering these questions is understanding the spatial and temporal variability of plume particle composition and mineralogy. Examination of this complex system requires the collection of numerous, spatiallydiscrete particle samples from hydrothermal plumes. Existing systems collect only a single combined sample -this has been the major obstacle to addressing our research questions.The SUPR sampler is designed to address this sampling need. It consists of a custom filtering head capable of sequentially collecting 25 discrete samples or 10 replicate pairs. This filtering head is interfaced with an 8 to 30 liter per minute pumping system. It can be deployed on a CTD rosette for spatially-discrete tow-yo sampling of non-buoyant hydrothermal plumes, on an ROV (e.g. Jason) for sampling rising plumes, or mounted on a fixed mooring in a hydrothermal vent field for time series sampling. In addition the SUPR sampler is designed with a long-term perspective for seafloor observatory deployments where it can be used to collect particulate samples as time series and in response to tectonic (or other) events. We see an increasing demand for this capabilityenabling both spatially-resolved and, importantly, temporallyresolved sampling of suspended particulates or microbes from a range of dynamic biogeochemical environments, not just hydrothermal systems. With such future applications in mind, and because many particle characteristics are short lived, the SUPR sampler has been designed to be compatible with in situ optical sensors based on visible and laser spectroscopy.

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The McLane WTS-LV: a large volume, high accuracy, oceanographic sampling pump

Cited by 8 publications

References 0 publications

Getting good particles: Accurate sampling of particles by large volume in‐situ filtration

Getting good particles: Accurate sampling of particles by large volume in‐situ filtration

A suspended-particle rosette multi-sampler for discrete biogeochemical sampling in low-particle-density waters

A Suspended Particle Rosette Sampler for Investigating Hydrothermal Plumes

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