關 食品微生物的 英翻中 10點 --5
Reference Methodology. In the field, active samplers were placed at various locations alongside the passive samplers as a reference method. An impinger with a total of 40mL of 3% H3BO3 was used as the reference method. The samplers consisted of two 60 mL glass vials with Teflon lined rubber septa connected in tandem by 1/8 in. Teflon tubing with plastic diffusion stones on the submerged end and a Teflon filter in a polypropylene holder at the inlet. Air flow rates were kept constant between 1.5 and 3L/min and were recorded at the start and end of sampling. The resulting solutions were analyzed conductometrically for NH4-N concentration by the UC Davis Division of Agriculture and Natural Resources (DANR) laboratory, and air concentrations were calculated by dividing the sample mass by the air volume. Sample Analysis. Following exposure, cassettes were returned to the laminar-flow hood, and the two spacer rings were removed along with the prefilter, which was discarded. Afterremovig the elution plugs, Teflon capillary rubes were connected to the centerinlets. The samples were eluted using10mL of distilled water dispensed dropwise from a syringe flow followed by compressed nitrogen gas to apply constant pressure to the eluant. Using an eight-channel manifold constructed for this purpose, eight cassettes were eluted simultaneously in about five minutes, allowing for high-throughput. After elution, sample solutions were analyzed by the UC Davis DANR laboratory using an established conductometric method. In this technique, the sample solution is injected into a continuous-flow sodium hydroxide solution, which carries the released ammonia gas to silicone rubber hollow tubes through which the gas diffuses to reach a second stream of deionized water; this solution then flows through an electrical conductivity cell that responds to ammonium in solution.
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參考方法學。 在領域，主動的樣品被作為一種參考方法在被動的樣品旁邊放在各種各樣的位置。 有3%的H3BO3的共40 mL的impinger被用作這種參考方法。 用線標出1/8一前一後連結在裡的橡膠隔壁，樣品用Teflon由兩個60個mL玻璃藥水瓶組成。 在進口在在一個聚丙烯持有者內的被浸泡的末端和一個Teflon 過濾器上的有塑膠擴散石頭的Teflon 管子。 空氣流動比率被在1.5 和3 L /分之間保持恆定並且開始被記錄和取樣的末端。 個導致的解決辦法分析給NH4 N 集中以UC戴維斯農業和自然資源(DANR)的劃分的conductometrically 實驗室，和空氣集中透過透過空氣空間分樣品群眾被計算。
樣品分析。 以下暴露，盒式錄音帶被返回那些laminar 流動排汽缸，並且這戒指二間隔被與那些prefilter 除去，被丟掉。 Afterremovig elution 塞子，Teflon毛細管鄉巴佬連接centerinlets。 隨後有壓縮氮氣體把恆定的壓力敷於eluant 樣品eluted 分發dropwise從一注射器那裡的蒸餾水的using10mL 流動。 使用一根8 條信道的歧管為這目的建造，8 只盒子在大約5 分鐘同時是eluted，考慮到高透過量。 在elution之後，UC戴維斯DANR實驗室使用一種建立的conductometric 方法分析了樣品解決辦法。 用這種技術， 樣品溶液被注入到連續流鈉氫氧化物溶液， 運送釋放的氨水氣體給矽橡膠氣體擴散到達一連串第二使消去電離的水的空的管； 這解決辦法然後流過對銨作出回應溶解狀態中的一電傳導性細胞。Source(s): Dr.eye 7.0 專業版