Water Monitoring Equipment such as the CLAM, is a state-of-the-art small submersible extraction sampler using EPA approved SPE (Solid Phase Extraction) media to sequester Pesticides, Herbicides, PAH’s, TPH, and other trace organics from water.
The CLAM is a water monitoring equipment that uses low flow rate extraction sampling, drawing water continuously through the extraction media. It provides an extraction event that can be hours long (up to 36 hours), allowing capture of trace pollutants from illicit and episodic events. The CLAM is ideal for applications such as sampling of urban water systems, rivers, wastewater treatment effluent, monitoring wells, drinking water systems, watersheds and lakes, agricultural runoff, storm water and marine environments.
The CLAM actually extracts the water in-situ, with the same technology the labs use on the bench. It provides a pre-extracted quantitative sampling event representing up to a hundred liters of water, lowering the laboratories detection limits a hundred fold. The small extraction disk is all that is sent to the laboratory for solvent elution and analysis.
CLAM Product Specifications
CLAM Product Specifications
- Low detection; up to 100 liters with a single field extraction
- Uses low flow rate extraction sampling (5-75 ml/minute)
- The small extraction disk is the only item to be sent to the lab for solvent elution and analysis
- Weighs just over one pound, including the four (4) AA batteries
- Nylon body housing has Luer lock fittings which allow the filter to be locked to the CLAM’s body, and interlocking of different filter types in two stage assemblies
- SPE disk comes loaded with a wide variety of media for both polar and nonpolar compounds. (Medias are the same as used in labs everyday)
- Micro pump suction draws the water through the extraction media first, preventing analyte surface absorption on tubing and pumps
- The media and housing uses special lofted filters to retard fouling
- Unique flow design prevents contamination in tubing or pump
Traditional Sampling Methods
Traditional Sampling Methods
Standard grab sampling only provides a few second snap shot in time, of a changing dynamic system. Automatic samplers are bulky, heavy, expensive, and only provide an intermittent sample. Passive samplers will provide a long term integrative partitioning event, but requires complicated mathematical modeling for any type of quantitative information, and is dependent on temperature, flow, and bio-fouling.
- CLAM Overview
- Information Sheet
- Extraction Disk Laboratory Method
- CLAM Assembly
- Detection Limits Page 1
- Detection Limits Page 2
- Retention/Depletion Study
- CLAM Totalizer CT Storm Water White Paper
- Field Studies
- USGS Study
- WA DOE Study
- Organochlorine Pesticides in LA
- Plastics in the Atlantic Ocean
- Gulf of Mexico Oil Spill
- Orange County Pesticides
- Pesticides in Salmonid
- Posters & More
- Deploying the CLAM (Video)
- CLAM Poster – Product Description
- Enhancing Bioassay Directed Analysis Using Submersible Time Integrative SPE Multimedia Trains
- CLAM Event Poster – Deep Water Horizon
- Time Integrative Dynamic Extractive Sampling
- Time Integrative Large Volume In Situ Water Extraction Total and Dissolved Trace Organics – The Ultra Low Requirement
- Traditional Sampling Methods
- Technical Information
Photo of the CLAM
CLAM Product Photos
C.L.A.M. in Use
Media Selections and Extraction Disk Technology
SPE Time Integrative Extractions Explained
A small dry disk is all that is sent to the laboratory for elution and analysis providing ultra-low detection. Submerged in-situ field extraction simply leaves the water behind saving on shipping costs. A disk after extracting 100 liters weighs less than one ounce, whearas100 liters of water could weigh over 300 pounds including bottles, ice and shipping coolers.
The ability to swap or snap on disks easily is a great advantage, but more important is the versatility to stage or snap different types of disks together. The CLAM allows you to obtain a simple whole water sample using a single SPE media disk, a total and dissolved by using a two stage glass pre-filter and SPE media disk, or multimedia sample by assembling one, two or three stage SPE media disks. Using a simple glass pre-filter disk in front to remove pelagic sediments, and a second SPE media disk that sequesters the dissolved pollutants, allows capture of both factions for extraction and analysis. Whole water may be obtained through a single SPE disk, and different SPE media types may be chained together for challenging sampling events.
The disks can be easily snapped on and off without worry about system contamination, allowing for long term extractive events where deployed disks are harvested and exchanged daily. This system provides the toxicologist and the environmental professional unique time integrative samples not obtained by existing systems.
Solid Phase HLB Extraction Disk
This media is best suited for semi-volatile organic analysis, EPA Method 1694 (pharmaceuticals and personal care products), emerging contaminants in wastewater and drinking water. It will retain a wide variety of non-polar and polar compounds such as: EPA 525 SOC’s, Pesticides, Pyrethroids, Herbicides, PBDE’s, Analgesics and Stimulants such as caffeine. They are self-wetting and will not lose functionality. The Oasis HLB media is a hydrophilic-lipophilic balanced, water-wettable polymer. It provides superior reverse phase capacity with a polar hook for enhanced retention of polar analytes. The properties of this disk will allow it to go dry for periods of time in the field, without affecting the analyte retention.
Solid Phase SPE (C18) Extraction Disk
High Capacity This media is the most prevalent and well established for non-polar compounds, and laboratories have standardized around its use. Many EPA methods have incorporated its use, for Pesticides, PAH’s, Semi-Volatiles, PCB’s, Dioxins, Furans, PBDE’s and other HRMS methods such as; EPA 1668 and 1614. EPA1664 gravimetric Oil & Grease may even be run using this media disk.
Pre-filter The glass fiber pre-filtration disk allows for toxological studies for total and dissolved trace organics. It can used in a two stage filter assembly, where the glass fiber filter removes the sediment and allows the water soluble organics to be retained on the bottom HLB or SPE type filter.
It can be used for gravimetric TSS, if the filter is oven dried and weighed before and after deployment.
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