sequential sampling analyzer Articles

  • Sequential Extraction Procedure

    Sequential extraction is an analytical process that chemically leaches metals out of soil, sediment and sludge samples. The purpose of sequential “selective” extraction is to mimic the release of the selective metals into solution under various environmental conditions. One commonly used sequential extraction procedure is designed to partition different trace metals based on their ...


  • Sequential extractions on mine tailings samples after and before bioassays: implications on the speciation of metals during microbial re-colonization

    Abstract  Mine tailings may be remediated using metal tolerant microorganisms as they may solve the limiting conditions for healthy development of plants (i.e., low organic mater content and poor physical conditions). The aim of this study was to investigate the consequences of microbial colonization on the chemical speciation of trace metals. Surface samples from the Valenciana mine ...


  • System Description for Monitoring Volatile Hydrocarbons

    To help build a comprehensive Industrial Hygiene program, Buck Scientific introduces the IH910 vapor monitoring system utilizing our model 910 gas chromatograph and IH300 air sampling train. Designed to analyze hydrocarbons in air, such as degreasing solvents and paint vapors emitted during plant operations, the IH910 penetrates the 1mg/m3 detection barrier erected by other field portable gas ...


    By Buck Scientific Inc

  • Geochemical Distribution of Selected Heavy Metals in Stream Sediments Affected by Tannery Activities

    Abstract  This study describes the geochemical distribution and potential mobility of selected heavy metals in sediments affected by tanneries established in the Cadeia-Feitoria River basin, South Brazil. Surficial samples were taken at ten sites, in January 2000, during dry season. Metal contents were determined according to their association with main sediment phases by applying a ...


  • Detection of pentachlorophenol in soil

    MATRIX: Soil ANALYTES: Pentachlorophenol (PCP) RANGE OF DETECTION: 100 ppb to 10 ppm MATERIALS: Pentachlorophenol RaPID AssayÒ kit and Sample Diluent Reagents: methanol (reagent grade), sodium hydroxide (ACS grade), distilled or deionized water. Equipment: reciprocating shaker, plastic bottles (polypropylene or ...


  • Mobility, binding behavior and potential risks of trace metals in the sediments of the fifth largest freshwater lake, China

    The trace metal pollution of sediments in Chaohu Lake, one of the most highly eutrophic lakes in East China, was investigated. Surface sediment (0–5 cm) samples were collected from 35 different positions and analyzed by inductively coupled plasma optical emission spectrometry to determine trace metal contents. Results showed that the mean content of trace metals was as follows: Cr, 85.09 ...


    By IWA Publishing

  • Identifying the causes of sediment‐associated toxicity in urban waterways in South China: Incorporating bioavailabillity‐based measearuments into whole‐sediment toxicity identification evaluation

    Sediments in urban waterways of Guangzhou, China were contaminated by a variety of chemicals and showed prevalent toxicity to benthic organisms. A combination of whole‐sediment toxicity identification evaluation (TIE) procedure and bioavailability‐based extraction approaches were used to identify the causes of sediment toxicity. Four of the six sediment samples collected caused 100% mortality ...


    By John Wiley & Sons, Ltd.

  • Ultra-trace arsenic speciation at Columbia Analytical

    Ultra-trace speciation of arsenic and other metals is performed using a variety of techniques tailored to the specific combination of species, matrix, and detection limits required. Currently, two analytical systems are applied: Ion Chromatography-Inductively Coupled Mass Spectrometry (IC-ICP-MS) and Hydride Generation-Cryogenic Gas Chromatography-Flame Atomic Absorption Spectrometry ...


  • Time is of the essence in plastics

    Introduction Determining the moisture content in plastics is an important step in the extrusion and molding process of many industrial resins.  Excessive moisture content can lead to microscopic steam pockets that can blister or weaken the integrity of the molded product.  Plastic pellets in a saturated or ‘wet’ state can also mislead buyers of bulk plastic since ...


    By Arizona Instrument LLC

  • Method 301 Evaluation of Candidate conditional methods case study

    A new metal emissions measurement and validation system has recently been developed that has the potential to significantly improve our understanding of metal emissions from a wide range of source categories. This system consists of: A continuous emission monitoring system (Xact-CEMS) An instrumental analyzer procedure (Xact-IAP) A sampling and analysis measurement method ...


    By Cooper Environmental

  • Maintaining biodiesel quality standards

    A problem that is sometimes encountered with biodiesel blends is inaccurate blend ratios. This article describes a quick analytical method to assess blend ratios and ensure fuel performance. According to a study1 done by the National Renewable Energy Laboratory, the chief problem found with biodiesel blends was inaccurate blend ratios. Retail customers and fleet managers do not typically worry ...


    By Spectro Scientific

  • ORP and pH Based Control of SBR Cycles for Nutrient Removal from Wastewater

    ABSTRACTContinuous monitoring of multiple process functions were conducted involving removals of BOD, TSS and nutrients, in each cycle of the SBR reactor at the wastewater treatment plant of the City of Carrabelle, FL. On line, real time, monitoring of pH, oxidation reduction potential (ORP), dissolved oxygen (DO), ammonia-N, nitrite-N, nitrate-N and orthophosphate-P demonstrated excellent ...

  • Expanding the applications of micro irrigation `Drip` treatment and disposal systems in Delaware

    Abstract An 18–month field evaluation of four micro–irrigation "drip" treatment and disposal systems was conducted to determine if reducing the separation distance between the bottom of the drip–line and the seasonal high water table (limiting condition) could be reduced from 18 inches to 12 inches. In this study three systems did not have advanced ...


    By Geoflow, Inc.

  • Pilot-Scale Biofilter Test for Treating Zimpro Odors

    The thermal sludge conditioning process of U.S. Filter/Zimpro Corporation, Rothschild, Wisconsin (Zimpro process) is primarily used to improve dewatering characteristics of the waste sludge. The process entails a partial breakdown through oxidation and hydrolysis of complex, high molecular weight organic compounds, such as, proteins, fibers, carbohydrates, and fats. The partial breakdown of ...


    By PRD Tech, Inc.

  • The Use of Hydrogen Release Compound (HRC) for CAH Bioremediation.

    Hydrogen Release Compound (HRC™) is a simple, passive, low-cost and long-term option for the anaerobic bioremediation of chlorinated aliphatic hydrocarbons (CAHs) via a reductive dehalogenation pathway. Applications to other classes of chlorinated compounds that are anaerobically degradable by this mechanism are under investigation. HRC should be viewed as a tool for the enhancement of natural ...


    By REGENESIS

  • Beliefs, Politics, and Environmental Policy

    Introduction Many of us who work on environmental issues have faced the challenge of conveying their importance to nonspecialists. Perhaps we have found ourselves defending the robustness of climate science to a contrarian uncle, or extolling the importance of biodiversity to a dubious aunt. Our relations and friends are often educated people, skilled in their own professions, who have ...


    By Oxford Journals

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