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185 条记录 (耗时 0.014 秒)

    Rapid extraction, separation, and detection method for a separate analysis of free and total sulfites in foods by ion chromatography
    21.
    发明授权
    Rapid extraction, separation, and detection method for a separate analysis of free and total sulfites in foods by ion chromatography 失效
    快速提取，分离和检测方法，通过离子色谱法分离食品中的游离和总亚硫酸盐

    公开(公告)号：US4780417A

    公开(公告)日：1988-10-25

    申请号：US19082

    申请日：1987-02-25

    申请人： Hie-Joon Kim ,  Young-Kyung Kim

    发明人： Hie-Joon Kim ,  Young-Kyung Kim

    IPC分类号： G01N30/96 ,  G01N33/02

    CPC分类号： G01N30/96 ,  G01N33/02 ,  Y10T436/156666 ,  Y10T436/184 ,  Y10T436/188

    摘要： A process for the rapid extraction, separation, and detection of free and total sulfites in food is disclosed. The process comprises the steps of (a) extracting sulfites from a sample in the presence of a medium having a selected pH to produce an extractant; (b) filtering the extractant; (c) subjecting the filtered extractant to anion exclusion chromatography to produce a sulfite-containing effluent; and (d) detecting the proportion of sulfites in the effluent. The process may be used either to determine free sulfites (by performing extraction in the presence of an acid medium), or to determine total sulfites (by performing extraction in the presence of an alkaline medium). The process of the present invention may be used to determine sulfite levels of 1.0 ppm or less.

    摘要翻译： 公开了一种快速提取，分离和检测食品中游离和总亚硫酸盐的方法。 该方法包括以下步骤：（a）在具有选定pH的介质存在下从样品中提取亚硫酸盐以产生萃取剂; （b）过滤萃取剂; （c）将经过滤的萃取剂进行阴离子排阻层析以产生含亚硫酸盐的流出物; 和（d）检测流出物中亚硫酸盐的比例。 该方法可用于测定游离的亚硫酸盐（通过在酸性介质存在下进行萃取），或者确定总亚硫酸盐（通过在碱性介质的存在下进行萃取）。 本发明的方法可用于测定1.0ppm或更低的亚硫酸盐含量。

    Chemical analysis with coated, light waveguide under humidity control
    22.
    发明授权
    Chemical analysis with coated, light waveguide under humidity control 失效
    化学分析与涂层，光波导在湿度控制下

    公开(公告)号：US4106909A

    公开(公告)日：1978-08-15

    申请号：US781596

    申请日：1977-03-28

    申请人： Donald J. David ,  Michael C. Willson

    发明人： Donald J. David ,  Michael C. Willson

    IPC分类号： G01N21/77 ,  G01N33/00 ,  G01N21/00 ,  G01N21/46

    CPC分类号： G01N21/7703 ,  G01N33/0011 ,  Y10T436/15 ,  Y10T436/175383 ,  Y10T436/184 ,  Y10T436/186 ,  Y10T436/204998

    摘要： A coated waveguide holder-humidifier to supply moisture in the case of moisture-sensitive reactions in order that quantitative results might be obtained with a gradient light analytical detector which will quantitatively measure atmospheric contaminants by comparing changes in light transmission through the coated waveguides before and after exposure. The coated waveguide holder-humidifier comprises a container, a porous material capable of absorbing water and desorbing water vapor mounted within the container, means to hold one or more waveguides within the container, and one or more openings in the container to allow fluid (liquid or gas) sample to contact a waveguide. Also, a method for improving the sensitivity of gaseous reactants on a waveguide where the reaction is moisture sensitive comprising humidifying the environment of said waveguide providing an atmosphere which has a substantially constant humidity normally in the range of 85 to 100% at which said reaction is not appreciably affected by changes in ambient relative humidity.

    摘要翻译： 一种涂层波导管加湿器，用于在潮湿敏感反应的情况下提供水分，以便可以通过梯度光分析检测器获得定量结果，梯度光分析检测器将通过比较前后涂层波导的透光率来定量测量大气污染物 曝光。 涂覆的波导保持器 - 加湿器包括容器，能够吸收水并解吸安装在容器内的水蒸气的多孔材料，用于在容器内容纳一个或多个波导的装置，以及容器中的一个或多个开口以允许流体 或气体）样品接触波导。 另外，提高气体反应物在波导上的敏感性的方法，其中反应是湿气敏感的，包括加湿所述波导的环境，提供具有基本上恒定的湿度的气氛，通常在85-100％的范围内，所述反应是 不受环境相对湿度变化的影响。

    Control system for sulfur process
    23.
    发明授权
    Control system for sulfur process 失效
    硫处理控制系统

    公开(公告)号：US3985864A

    公开(公告)日：1976-10-12

    申请号：US526939

    申请日：1974-11-25

    申请人： Lucien H. Vautrain ,  Herbert A. Ems

    发明人： Lucien H. Vautrain ,  Herbert A. Ems

    IPC分类号： C01B17/04

    CPC分类号： C01B17/0413 ,  C01B17/0452 ,  Y10S423/05 ,  Y10T436/184

    摘要： The flow rate of the oxygen-containing gas to a process for the oxidation of the hydrogen sulfide in a sour gas to sulfur is regulated responsive to the lower of the sour gas pressure signal and a signal representing the value of the sour gas flow rate as modified by the ratio of hydrogen sulfide to sulfur dioxide in the gaseous reaction effluent, to maintain the desired ratio of hydrogen sulfide to oxygen fed to the process. The sour gas flow rate can be regulated responsive to the higher of the sour gas pressure signal and the oxygen-containing gas flow rate signal.

    摘要翻译： 响应于较低的酸性气体压力信号和表示酸性气体流量的值的信号，将含氧气体与硫酸气体中的硫化氢氧化为硫的方法的流量调节为 通过气态反应流出物中硫化氢与二氧化硫的比例进行改性，以保持所需的硫化氢与进料过程中的氧气的比例。 响应于较高的酸性气体压力信号和含氧气体流量信号，可以调节酸性气体流量。

    Environmental monitoring device and method
    24.
    发明授权
    Environmental monitoring device and method 失效
    环境监测装置及方法

    公开(公告)号：US3847552A

    公开(公告)日：1974-11-12

    申请号：US41832173

    申请日：1973-11-23

    申请人： IBM

    发明人： HOBGOOD L ,  LORENZEN J

    IPC分类号： G01N31/00 ,  G01N31/22 ,  G01N33/00 ,  G01N21/12

    CPC分类号： G01N33/0027 ,  G01N33/0013 ,  Y10T436/184 ,  Y10T436/218

    摘要： A method of simultaneously measuring the quantitative presence of a plurality of atmospheric pollutants and apparatus for performing the measurement is disclosed. Specific dry reagents which react with particular pollutants to be measured are exposed in a staged array according to their reactivity to a known volume of ambient air at a location to be measured. The reaction products are later analyzed to obtain a quantitative measure of the pollutants present in the sample.

    摘要翻译： 公开了同时测量多个大气污染物的定量存在的方法和用于进行测量的装置。 与要测量的特定污染物反应的特定的干试剂根据其在待测量的位置对已知体积的环境空气的反应性而以分级阵列暴露。 随后对反应产物进行分析，以获得样品中存在的污染物的定量测量。