Sensitive detection of urea and related compounds in water
    1.
    发明授权
    Sensitive detection of urea and related compounds in water 有权
    尿素和相关化合物在水中的敏感检测

    公开(公告)号:US07662637B2

    公开(公告)日:2010-02-16

    申请号:US10498180

    申请日:2002-12-02

    申请人: Richard D. Godec

    发明人: Richard D. Godec

    IPC分类号: G01N33/00 C12M1/34 C12M3/00

    摘要: Methods and apparatus (FIG. 4a) are disclosed for selective and very sensitive detection of certain hydrolyzable compounds, especially urea, in water by hydrolyzing said hydrolyzable compounds in a sample of the water to one or more carbon dioxide group compounds and determining the difference in the carbon dioxide content of the water and the hydrolyzed sample using conductivity measurements or other carbon dioxide detector outputs.

    摘要翻译: 公开了方法和装置(图4a),用于通过将水样中的所述可水解化合物水解成一种或多种二氧化碳基化合物来选择和非常敏感地检测水中的某些可水解化合物,特别是尿素,并确定 使用电导率测量或其他二氧化碳检测器输出的水和水解样品的二氧化碳含量。

    Analytical apparatus for serial determination of nitrogen in samples by
the Kjeldahl method
    2.
    发明授权
    Analytical apparatus for serial determination of nitrogen in samples by the Kjeldahl method 失效
    用凯氏定氮法测定样品中氮的分析仪器

    公开(公告)号:US3964869A

    公开(公告)日:1976-06-22

    申请号:US594937

    申请日:1975-07-11

    IPC分类号: G01N31/00 G01N31/16 G01N33/00

    CPC分类号: G01N31/002

    摘要: This invention provides for an analytical apparatus for serial determination of nitrogen in samples by the Kjeldahl method, characterized in that it comprises from 4 to 7 flasks suspended vertically in a rotatable roundabout, each provided with a cover and a side tube extending into a common central container for the collection of combustion products, the roundabout being connected to a device which at regular intervals turns the roundabout one step forward to the next position, means for heating the flasks in one or two of the positions, means for blowing cooling air against the flasks, means for feeding diluent water to the flasks in a following position, means for introducing neutralising chemicals, means for generating and feeding steam to the flasks in the next following position, means for collecting and titrating the distillate, blowing means for emptying the flasks in the last position, and means for opening the covers on completion of the decomposition and for introducing diluent water into the flasks.

    摘要翻译: 本发明提供了一种用于通过凯氏定氮方法连续测定样品中的氮的分析装置,其特征在于,其包括4至7个在垂直方向上悬挂在可旋转的环形交叉口中的烧瓶,每个设置有盖和延伸到公共中心 用于收集燃烧产物的容器,所述环形交叉口连接到以规定间隔将所述迂回转向一步前进到下一位置的装置,用于在一个或两个位置加热所述烧瓶的装置,用于将冷却空气吹向所述装置的装置 烧瓶,用于在随后的位置向稀释水供给稀释水的装置,用于引入中和化学品的装置,用于在下一个位置产生和供给蒸汽的装置,用于收集和滴定馏出物的装置,用于排空烧瓶的吹风装置 在最后的位置,以及在分解完成时打开盖子并引入稀释剂的装置 将水倒入烧瓶中。

    Nitric oxide analysis
    3.
    发明授权
    Nitric oxide analysis 失效
    氮氧化物分析

    公开(公告)号:US3652227A

    公开(公告)日:1972-03-28

    申请号:US3652227D

    申请日:1969-12-15

    CPC分类号: G01N31/002 Y10T436/179228

    摘要: Method and apparatus for determining the nitric oxide content of a sample gas stream. The nitric oxide in the gas stream is reacted with an excess amount of ozone so as to completely convert the nitric oxide into nitrogen dioxide. The resulting gas containing nitrogen dioxide and residual ozone is passed through a scrubber which removes the ozone and does not affect the nitrogen dioxide content of the gas. The resulting gas is then analyzed for its NO2 content, which is a function of the nitric oxide content of the sample gas. The method and apparatus may also be utilized for determining the total amount of nitrogen dioxide and nitric oxide in a sample gas. The invention is particularly applicable to the monitoring of air for air pollution control.

    摘要翻译: 用于确定样品气流的一氧化氮含量的方法和装置。 气流中的一氧化氮与过量的臭氧反应,以将一氧化氮完全转化为二氧化氮。 所产生的含有二氧化氮和残余臭氧的气体通过洗涤器,其除去臭氧并且不影响气体的二氧化氮含量。 然后分析所得气体的NO 2含量,其是样品气体的一氧化氮含量的函数。 该方法和装置也可用于确定样品气体中二氧化氮和一氧化氮的总量。 本发明特别适用于空气污染控制的空气监测。

    Process for determination of nitrogen
    5.
    发明授权
    Process for determination of nitrogen 有权
    氮的测定方法

    公开(公告)号:US06287868B1

    公开(公告)日:2001-09-11

    申请号:US09362722

    申请日:1999-07-29

    申请人: Jan-Åke Persson

    发明人: Jan-Åke Persson

    IPC分类号: G01N3100

    CPC分类号: G01N31/002 Y10T436/176152

    摘要: A process is claimed for the determination of nitrogen content in a nitrogen containing material, said process comprising: a) at least one pre-treatment step, b) at least one distillation step and c) at least one determination step; wherein said distillation step (a) comprises the substeps of: i) diluting a pre-treated sample of a nitrogen containing material with at least one diluting fluid, ii) inputting steam for commencement of steam distillation, and iii) adding at least one alkali compound, whereby the addition of alkali is made 1-60 seconds after commencement of said inputting of steam and said steam distillation and whereby distillate produced during said steam distillation is recovered in an acidic and/or complexing medium.

    摘要翻译: 要求用于测定含氮材料中氮含量的方法,所述方法包括:a)至少一个预处理步骤,b)至少一个蒸馏步骤和c)至少一个测定步骤; 其中所述蒸馏步骤(a)包括以下子步骤:i)用至少一种稀释液稀释含氮材料的预处理样品,ii)输入蒸汽以开始蒸汽蒸馏,和iii)加入至少一种碱 化合物,由此在所述输入蒸汽和所述蒸汽蒸馏开始后1-60秒内加入碱,由此在所述蒸汽蒸馏期间产生的馏出物在酸性和/或络合介质中回收。

    Digestion apparatus useful for a kjeldahl method
    6.
    发明授权
    Digestion apparatus useful for a kjeldahl method 失效
    用于凯氏定氮法的消化装置

    公开(公告)号:US4882286A

    公开(公告)日:1989-11-21

    申请号:US104569

    申请日:1987-10-02

    摘要: A microwave-based apparatus for rapid digestion of a sampel by a Kjeldahl method is provided which includes a reaction vessel surrounded by an insulator in the form of, for example, a cup. The reaction vessel is disposed in the internal chamber of a microwave system, which includes a wall having an aperture. A connector tube is slidably disposed in the aperture, wherein one end of the tube is connected to the mouth of the reaction vessel, and the other end is connected to a suction device external to the chamber. A biasing element is provided outside the chamber to assist in joining the slidable connector tube to the mouth of the vessel, yet enabling removal of the vessel from the chamber without detachment of the biasing element.

    摘要翻译: 提供了一种通过凯氏定氮法快速消化血管的基于微波的装置,其包括由例如杯形式的绝缘体包围的反应容器。 反应容器设置在微波系统的内部室中,其包括具有孔的壁。 连接管可滑动地设置在孔中,其中管的一端连接到反应容器的口部,另一端连接到腔室外部的抽吸装置。 偏压元件设置在室外部,以帮助将可滑动的连接管连接到容器的口部,但是能够在没有偏置元件脱离的情况下从容器中取出容器。

    Microwave-based Kjeldahl method
    10.
    发明授权
    Microwave-based Kjeldahl method 失效
    基于微波的凯氏定氮法

    公开(公告)号:US4946797A

    公开(公告)日:1990-08-07

    申请号:US301805

    申请日:1989-01-25

    摘要: A rapid, microwave-based Kjeldahl digestion method wherein microwave energy is applied to an acid/sample mixture at the beginning of, and thereafter during the digestion. After the application of microwave energy is discontinued, the digestate is diluted by pulsed addition of water, followed by continuous addition of water. Dilution in this manner prevents a sudden surge in gas evolution, and eliminates the need for an intervening cooling step, thereby reducing processing time. Also provided is a method for fat separation from a fat-containing protein sample during the digestion.

    摘要翻译: 一种快速的基于微波的凯氏定氮消化法,其中微波能量在消化过程开始时和之后施加到酸/样品混合物上。 微波能量停止使用后,通过脉冲加水稀释消化液,连续添加水分。 以这种方式稀释可以防止气体逸出的突然的浪涌,并且不需要中间冷却步骤,从而减少处理时间。 还提供了一种在消化期间从含脂肪的蛋白质样品中分离脂肪的方法。