homogenizing laboratory sample Articles

  • Sample Size for Laboratory Calibration of Subsurface Neutron Moisture Gauges

    The estimation of adequate sample size is critical to all laboratory methods of calibration of neutron moisture gauges. Neutron gauge response is a function of the true sample geometry rather than an arbitrarily defined spherical geometry. A two-group solution is obtained for neutron flux in a homogeneous, finite, cylindrical sample. The theoretical flux distributions for this solution and for ...


    By ASTM International

  • Sample Handling Strategies for Accurate Lead-In-Soil Measurements in the Field and Laboratory

    ABSTRACT The inhomogenous lead-in-soil matrix can present serious obstacles to accurate sample collection and handling. In typical lead-in-soil measurement, particle size related errors in sampling and sample handling often exceed all other sources of error. The magnitude of error can vary widely depending on the particulate nature of the lead contaminant and the effectiveness of control ...

  • Analysis of biogenic amines food and physiological samples

    Histamine and other polyamines such as Putrescine, Cadaverine, Spermidine and Spermine are products of decomposition. The level of histamine, in particular, has been used as a regulatory guideline for degree of decomposition in fish. Also, Histamine and Tyramine levels are of interest to producers of wine and cheese. The polyamines, Spermidine, Spermine and Putrescine are elevated in neoplastic ...


    By Pickering Laboratories, Inc.

  • Comparing Field Portable X-Ray Fluorescence (XRF) To Laboratory Analysis Of Heavy Metals In Soil

    ABSTRACT Field portable x-ray fluorescence (XRF) continues to gain acceptance as a complement to traditional laboratory testing of metal contaminated soil. The quality of data produced by field XRF varies with site conditions, soil composition, and sample preparation. Quality assurance protocols for the field method usually require that a number of field samples be split and sent to a ...

  • Low-Flow (Minimal Drawdown) Ground-Water Sampling Procedures

    Untitled Document Background The Regional Superfund Ground Water Forum is a group of ground-water ...


    By Solinst Canada Ltd.

  • EPA studies identify techniques for critical leak testing prior to soil-vapor sampling

    Researchers at EPA’s National Risk Management Research Laboratory (NRMRL) in Ada, OK, are developing quality assurance (QA) measures for soil-gas and sub-slab sampling methods that help differentiate contaminant vapors due to vapor intrusion from background sources. Recent research focused on measures to identify leakage of ambient air into conventional vapor probes, which can significantly ...

  • Case study - EPH in soil evaluation study at tank farm site

    Ambient Engineering, Inc. (Concord, MA) used Sitelab to investigate and remediate a former tank farm along Boston Harbor contaminated by a large, subsurface plume of commingled diesel fuel and No. 6 fuel oil. Ambient’s Licensed Site Professional (LSP) had the opportunity – and budget – to evaluate Sitelab against three certified laboratories. Soil samples were collected from ...


    By Sitelab Corporation

  • Precellys application focus cancer research oncology - case study

    Cancer research laboratories working with tumor tissues derived from animal models (1,2) or xenografts (3) face difficulties in homogenizing these tough samples using traditional methods (4). The Precellys homogenizers provides high speed sample disruption based on bead- beating technology for the extraction of DNA, RNA, protein, enzymes and metabolites within minutes. It ensures high ...


    By Bertin Technologies

  • Detection of atrazine, alachlor, cyanazine and metolachlor in corn

    MATRIX: Grain corn ANALYTES: Atrazine, Alachlor, Cyanazine, and Metolachlor RANGE OF DETECTION: Atrazine: 20-1000 ppb Alachlor: 20-1000 ppb Cyanazine: 20-600 ppb Metolachlor: 20-1000 ppb MATERIALS: RaPID Assay Kit and Sample Diluent Reagents: methanol (pesticide grade), distilled or deionized ...


  • Case study - EPH in soil with No. 6 fuel oil

    No. 6 fuel oils (heavy fuel oil, bunker C oil) is often used in industry for heat, steam or power generation. A consultant used Sitelab to investigate two different spill sites contaminated with subsurface plumes of NAPL resulting from leaking underground storage tanks (USTs). Soils were collected from borings using a drill rig and field screened for their EPH aromatic content. Split samples ...


    By Sitelab Corporation

  • A geochemical and statistical approach for assessing heavy metal pollution in sediments from the southern Caspian coast

    Abstract: The nearshore marine environment of the Caspian sea is a major repository for toxic metals originating from various sources. Since the persistent toxic metals pose serious health risks this research concentrated on investigating the concentrations and spatial distribution of metals in the nearshore sediments along the Iranian coast of the Caspian sea. Fourteen sampling sites were ...

  • Detection of alachlor or atrazine in soy flour

    MATRIX: Soy flour ANALYTES: Alachlor and atrazine RANGE OF DETECTION: Alachlor: 20 to 1000 ppb, Atrazine: 14 to 400 ppb. MATERIALS: Alachlor RaPID AssayÒ kit and Sample Diluent. HS Atrazine RaPID AssayÒ kit and Sample Diluent. Reagents: methanol (pesticide grade); concentrated hydrochloric acid (ACS ...


  • Precellys application focus forensic - case study

    Forensic laboratories working with hard samples such as hair [1, 2J, bone [3], teeth, skin, etc. experience difficulties with DNA extraction due to the high energy needed to grind these tissues. Moreover, biological evidence is available in small quantities and the current techniques used do not provide high quality results. The Precellys homogenizers provides high speed sample disruption based ...


    By Bertin Technologies

  • Preferences and requirements for batch mixers used in the food industry

    In the food industry many end products are mixtures of solid substances. Examples of such products are dessert mixtures, sugar blends, instant drinks, dried soups and sauces, dietetic foods and spice mixtures. The great variety of constituents, such as milk powder, cream powder, sugar, cocoa, flour, vegetables, fungi, spices, fats (liquid and solid), places great demands on the batch ...


    By Gericke

  • Improving the reliability of closed chamber methodologies for methane emissions measurement in treatment wetlands

    Non-homogeneous mixing of methane (NHM) within closed chambers was studied under laboratory conditions. The experimental set-up consisted of a PVC vented chamber of 5.3 litres of effective volume fitted with a power-adjustable 12 V fan. NHM within the chamber was studied according to fan position (top vs lateral), fan airflow strength (23 vs 80 cubic feet per minute) and the mixing time before ...


    By IWA Publishing

  • The evaluation of extraction and cleanup methods for the determination of PCB aroclors in caulking and sealing material

    Buildings that were built and/or refurbished before 1977 may well have caulking used to seal masonry joints and windows that contain PCB Aroclor 1254 and/or 1260. The Aroclors were used as a plasticzier and were added to the material to ease application and improve resiliency. The caulking material has been mainly used when there are dissimilar materials, like brick next to concrete, metal window ...


  • TOC analyser improves lab efficiency

    Leading instrumentation company HACH LANGE is helping a number of key customers save valuable time and costs with its new IL550 TOC-TN analyser. TOC analysis is vitally important in applications ranging from power generation, wastewater, drinking water, surface water and ultrapure water, to agricultural soils, contaminated land and food. HACH LANGE analysers therefore offer a range of options ...


  • How HDXRF Helps Volcom Comply with Global Regulations - Case Study

    Volcom, Inc. is a lifestyle brand that designs, markets, and distributes high-quality boardsportsoriented products like clothing, footwear and accessories. As a global company, their restricted chemicals list is a combination and reflection of many international standards. CPSC and Proposition 65 lead the way for many of the chemicals’ lower limit regulations, but Canadian, Chinese, and ...


    By X-Ray Optical Systems (XOS)

  • Field-scale cleanup of atrazine and cyanazine contaminated soil with a combined chemical-biological approach

    A former agrichemical dealership in western Nebraska was suspected of having contaminated soil. Our objective was to characterize and remediate the contaminated site by a combined chemical-biological approach. This was accomplished by creating contour maps of the on-site contamination, placing the top 60 cm of contaminated soil in windrows and mixing with a mechanical high-speed mixer. ...

  • Instant Loss on Ignition Results for Trommel Fines

    Cost-effective compliance with landfill tax regimes Many issues have been raised with HMRC’s proposed Loss on Ignition (LOI) testing regime for landfill taxes, including concerns that tests will take too long to be actionable and will cost too much to perform with any regularity. This may indeed be true for samples sent to a laboratory, but there is an alternative: the ...


    By Arizona Instrument LLC

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