請幫忙翻譯(不要用google翻譯)

Because sensitivity of detection using SPME for pyrethroid analysis was low . Harwood et al ., (2013) suggested that it was difficult to measure freely – dissolved pyrethroid concentrations in field sediments using SPME fibers . Conversely , cypermethrin was detected at concentrations >RLs in 75% of Chebi Creek sediments , which made the present study the first successful attempt to use matrix-SPME for estimating toxicity caused by emerging contaminants acting as specific mode of action (e.g. sodium channel disrupting ) in field –collected sediment .

Although both approaches improved toxicity estimation , matrix – SPME showed a slightly better prediction of sediment toxicity than Tenax extraction , possibly because the two techniques measured different fractions of contaminants in sediment (Reichenberg and Mayer , 2006 ) . Tenax extraction measured the rapidly desorbing fraction of contaminants in sediment , or that fraction potentially accessible to the organisms , but was not a direct measure of the partitioning of sediment – associated contaminants . Rather , Cfree measured by matrix-SPME represented chemical activity at equilibrium and it controlled the partitioning process a contaminant among phases (Reichenberg and Mayer , 2006 ) . The main exposure route for H. azteca to contaminants in sediment is partitioning from porewater and overlying water (Wang et al., 2004 ) . the extremely low Cfree found in the present study suggested that most of the detected pyrethroids in Chebei Creek sediments were not bioavailable via partitioning . Although a good correlation was noted for the fractions of contaminants available for desorption (Tenax extraction ) and partitioning (matrix-SPME ) (You et al., 2011) , different desorption rates of cypermethrin from the sediment to the porewater may induce variability measurement . Therefore , (Cfree measured by SPME better predicted exposure of cypermethrin to H. azteca , and subsequently toxicity .

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  • Anonymous
    8 years ago
    Favorite Answer

    我有查到:

    因為使用固相微萃取對擬除蟲菊酯進行分析檢測的靈敏度較低。哈伍德 et al.,(2013),表明它是難以衡量的自由 — — 使用固相微萃取纖維的欄位沉積物溶解擬除蟲菊酯濃度。相反,氯氰菊酯檢測到的濃度 > RLs 在 75%的飛燕溪沉積物,作出本研究報告的首次成功嘗試使用矩陣-固相微萃取的估算作為行動的特定模式的新興污染物所致毒性 (如鈉通道中斷) 欄位 –collected 沉積物中。

    我並不確定是不是這樣,翻譯後真的怪怪的~

    我都看不懂@@

    希望有幫助到您~

    2013-05-27 18:45:02 補充:

    我沒有用google翻譯~

    Source(s): 自己
  • 7 years ago

    真諷刺...標題明明說不要 google 翻譯, 但選出來的最佳解答還是網路翻譯!!

    而最佳解答者自己也表明看不懂自己的翻譯, 我暈~~~

  • 晚風
    Lv 5
    8 years ago

    SPME (Solid-Phase Microextraction) 固相微萃取

    2013-05-29 09:32:43 補充:

    因為利用固相微萃取(SPME)作合成除蟲菊酯分析的靈敏度很低。Harwood等人認為利用固相微萃取纖維量測野外底泥內游離溶解的合成除蟲菊酯濃度有所困難。相反的,75%車陂涌底泥則檢出氯氰菊酯濃度高於RLs,使得本研究首度成功的利用矩陣固相微萃取估計野外收集底泥中以特定行為模式反應(如鈉道破壞)之新興污染物所引起的毒性。雖然兩種方法都能改善毒性評估,矩陣固相微萃取對於底泥毒性的預估還是比Tenax萃取法稍微好點,可能是因為此二種技術所測度的是底泥中不同的汙染物比例(Reichenberg 與 Mayer , 2006 )。Tenax萃取法量測底泥中污染物的快速解吸比,或者有機體潛在接收的比率,而不是底泥相關污物分配(partitioning)的直接量測。反而,矩陣固相微萃取所測出的自由溶解濃度代表平成狀態下的化學活性,而它控制著汙染物在各相之間的分配過程(Reichenberg 與Mayer , 2006 )。底泥中端足蟲到汙染物的主要暴露途徑是來自於孔隙水和表層水的分配(partitioning) (Wang et al., 2004 )。本報告中所發現極低的自由溶解濃度顯示大部分車陂涌底泥偵測到的合成除蟲菊酯並未具有經分配後的生物利用性。雖然有注意到適於解吸(Tenax萃取法)與分配(矩陣固相微萃取)之汙染物比例間的關聯性,底泥到孔隙水不同的賽滅寧(Cypermethrin)解吸率也可能導致變異性量測。因此,以固相微萃取(SPME)法所測得的自由溶解濃度較能預測賽滅寧(Cypermethrin)到端足蟲(H. azteca)的暴露以及後續的毒性。說明:1. sediment (沉積物):本研究中指的是河道底泥。2. partitioning (分配):有機污染物進入土壤有機質的過程。3. Cfree (freely dissolved concentration):自由溶解濃度

    2013-05-29 09:33:08 補充:

    因為利用固相微萃取(SPME)作合成除蟲菊酯分析的靈敏度很低。Harwood等人認為利用固相微萃取纖維量測野外底泥內游離溶解的合成除蟲菊酯濃度有所困難。相反的,75%車陂涌底泥則檢出氯氰菊酯濃度高於RLs,使得本研究首度成功的利用矩陣固相微萃取估計野外收集底泥中以特定行為模式反應(如鈉道破壞)之新興污染物所引起的毒性。

    雖然兩種方法都能改善毒性評估,矩陣固相微萃取對於底泥毒性的預估還是比Tenax萃取法稍微好點,可能是因為此二種技術所測度的是底泥中不同的汙染物比例(Reichenberg 與 Mayer , 2006 )。Tenax萃取法量測底泥中污染物的快速解吸比,或者有機體潛在接收的比率,

    2013-05-29 09:34:00 補充:

    而不是底泥相關污物分配(partitioning)的直接量測。反而,矩陣固相微萃取所測出的自由溶解濃度代表平成狀態下的化學活性,而它控制著汙染物在各相之間的分配過程(Reichenberg 與Mayer , 2006 )。底泥中端足蟲到汙染物的主要暴露途徑是來自於孔隙水和表層水的分配(partitioning) (Wang et al., 2004 )。本報告中所發現極低的自由溶解濃度顯示大部分車陂涌底泥偵測到的合成除蟲菊酯並未具有經分配後的生物利用性。雖然有注意到適於解吸(Tenax萃取法)與分配(矩陣固相微萃取)之汙染物比例間的關聯性,底泥到孔隙水不同的賽滅寧(Cypermethrin)解

    2013-05-29 09:34:47 補充:

    底泥到孔隙水不同的賽滅寧(Cypermethrin)解吸率也可能導致變異性量測。因此,以固相微萃取(SPME)法所測得的自由溶解濃度較能預測賽滅寧(Cypermethrin)到端足蟲(H. azteca)的暴露以及後續的毒性。

    說明:

    1. sediment (沉積物):本研究中指的是河道底泥。

    2. partitioning (分配):有機污染物進入土壤有機質的過程。

    3. Cfree (freely dissolved concentration):自由溶解濃度

    2013-05-29 09:37:01 補充:

    奇怪,上傳之後內容空白,只好利用"補充"上傳解答。

    Source(s): Nightwind, Nightwind, Nightwind, Nightwind, Nightwind
  • Shuang
    Lv 7
    8 years ago

    沒上文,不知 SPME 是那幾個字的代表,也許,你需要中日英化學化工大辭典來輔助其中的專有名詞,這不是在此就能弄懂全部內容的!

    2013-05-27 19:24:34 補充:

    假會‧

    2013-05-27 20:04:55 補充:

    What is SPME?

    Source(s): me, me, me
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