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onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="ynphjno" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593091764635/4502162.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="rgnuwar" class="content"><p><span>需求數量：</span>0</p><p><span>價格要求：</span>面議</p><p><span>所在地：</span>上海市</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產品關鍵詞：</span>司法檢測紫外可見分光光度計廠家供應,紫外可見分光光度計</p><p><span>***更新：</span>2020-11-09 07:21:38</p><p><span id="click" >瀏覽次數：0次</span></p><a rel="nofollow" class="button">聯系我們</a></div></div><div id="30gnkmo" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">上海儀電分析儀器有限公司</a></p><p><span>聯系人：</span>薛馬駿</p><p><span>郵箱: </span>ydfxwx@qq.com</p><p><span>電話: </span>18001994173</p><p><span>傳真: </span>021_</p><p><span>網址: </span>http://www.inesa-a.com</p><p><span>手機: </span>021-34530361</p><p><span>地址: </span>徐塘路88號7幢4層、9幢</p><p>[當前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="847xd77" class="page-proshow02"><p class="title">詳細說明</p><div id="8okmo8y" class="box"><p><p> 色譜技術比它起步晚了二百多年，但如今的色譜儀器（氣相、液相、氣質，司法檢測紫外可見分光光度計廠家供應、液質）占了分析界的大半壁江山。相較璀璨如星的各類的色譜儀器，紫外-可見分光光度計黯然了很多。 </p> <p> 紫外-可見分光光度計可以被更精確更高級的檢測手段所取代？可以退出“分析史”的舞臺？ </p> <p> NO！NO！NO！ </p> <p> 事實上紫外-可見分光光度計（下文簡稱紫外分光光度計），依然是“分析舞臺”的美玉，低調有內涵，親民有價值。一起來發(fā)現它在日化產品分析中的美和價值吧。原理分子的紫外可見吸收光譜是由于分子中的某些基團吸收了紫外可見輻射光后，發(fā)生了電子能級躍遷而產生的吸收光譜。由于各種物質具有各自不同的分子、原子和分子空間結構，其吸收光能量的情況也就不會相同，因此，每種物質都有其特有的，司法檢測紫外可見分光光度計廠家供應、固定的吸收光譜曲線，司法檢測紫外可見分光光度計廠家供應，可根據吸收光譜上某些特征波長處吸光度的高低判別或測定該物質的含量，這就是分光光度定性和定量分析的基礎。紫外可見光的范圍內，對于一個特定的波長，吸收的程度正比于試樣中該成分的濃度，可以進行定性分析。司法檢測紫外可見分光光度計廠家供應</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="司法檢測紫外可見分光光度計廠家供應,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396593091764635/4502162.png"></div>紫外可見分光光度計使用中常見問題解析 <p> 在一般分光光度計的使用說明書上，要求儀器預熱時間約20分鐘；若是帶微處理器的分光光度計，開機后儀器自動進入自檢(初始化)狀態(tài)，約需1O分鐘左右。在分光光度計預熱這個環(huán)節(jié)上，很多使用者或多或少存在問題，如開機只預熱電路系統(不調節(jié)波長、打開吸收池暗箱蓋預熱等)或認為初始化過程就是預熱等等。對帶微處理器有自檢功能的分光光度計，開機后儀器自檢(初始化)結束后，在測定窗口上，設置所需波長值，用一個吸收池裝上純凈水置于光路上，調“0000A”后，預熱儀器，當儀器顯示讀數不再變化后即可進行測定。 </p> <p> 對于紫外可見分光光度計，由于有雙光源(鎢燈與氘燈)，為了延長燈的使用壽命，開機自檢完成后可以關掉測定時不用的光源燈。高校紫外可見分光光度計代理紫外可見分光光度計，可以通過更換光源分別形成可見和紫外光區(qū)，測定的波長在200～1000nm。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="司法檢測紫外可見分光光度計廠家供應,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592155319523/9592810.png"></div><p> 紫外可見分光光度計的特點分光光度法對于分析人員來說，可以說是常用和有效的工具之一。幾乎每一個分析實驗室都離不開紫外可見分光光度計。分光光度法具有以下主要特點。 </p> <p> 1靈敏度高 </p> <p> 由于新的顯色劑的大量合成，并在應用研究方面取得了可喜的進展，使得對元素測定的靈敏度有所推進，特別是有關多元絡合物和各種表面活性劑的應用研究，使許多元素的摩爾吸光系數由原來的幾萬提高到數十萬。 </p> <p> 2選擇性好 </p> <p> 目前已有些元素只要利用控制適當的顯色條件就可直接進行光度法測定，如鈷、鈾、鎳、銅、銀、鐵等元素的測定，已有比較滿意的方法了。 </p> <p> 3準確度高 </p> <p> 對于一般的分光光度法，其濃度測量的相對誤差在1～3%范圍內，如采用示差分光光度法進行測量，則誤差可減少到0.X%。 </p> <p> 4適用濃度范圍廣 </p> <p> 可從常量(1%～50%)(尤其使用示差法)到痕量(10-8～10-6%)(經預富集后)。 </p> <p> 5分析成本低、操作簡便、快速、應用廣 </p> <p> 由于各種各樣的無機物和有機物在紫外可見區(qū)都有吸收，因此均可借此法加以測定。到目前為止，幾乎化學元素周期表上的所有元素(除少數放射性元素和惰性元素之外)均可采用此法。在國際上發(fā)表的有關分析的論文總數中，光度法約占28%，我國約占所發(fā)表論文總數的33%。 </p><p> 使用紫外分光光度計的過程中，經常會遇到儀器因光源達不到要求，需要進行調修。要求光源燈處不能有空氣流動，因為單光束儀器很忌諱空氣快速流動而使光源燈的色溫發(fā)生變化。如遇電壓正常而鎢燈不亮時，就需要更換鎢燈。更換時，不要用手直接接觸燈泡表面，如果手指摸過，應用無水乙醇和C4H10O混合液擦拭干凈，否則通電后指印遇熱不能去除。安裝光源燈后要注意調整光路。光源燈有兩個引線頭，安裝時用導線焊接，主要是防止接觸不良而造成的光源發(fā)光不穩(wěn)現象。在焊接時防止焊點與燈頭銅皮碰上，裝上燈座使電源短路。燈絲要求平直，如果燈絲彎曲，會影響光能量。燈絲的位置要與入射狹縫平行并對準，上、下、左、右調節(jié)后緊固螺釘。擰緊燈座的螺紋套，可用鉗子擰緊，一般燈頭盡量往燈座里塞，因為多數燈絲離燈頭偏高。調整燈位置的前后可移動整個燈座架，它下面有三個固定螺釘，先稍松后，移動前后位置再固定。一般調節(jié)鎢燈的位置時，將波長調到580nm處，狹縫調到MAX，把一張白紙置于比色皿盒邊出口處，觀察白紙上的光斑。若光斑上方左右角均不完整成半圓弧，可能是光源燈高度不對；光斑左邊或右邊不完整，可調光源燈底座位置。調整至白紙上可見明亮、均勻的長方形黃橙色光斑。紫外可見分光光度計主要由光源系統、單色器系統、樣品室、檢測系統組成。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="司法檢測紫外可見分光光度計廠家供應,紫外可見分光光度計" src="https://tyunfile.71360.com/WaterMark/UploadFile/ydfx123/637396592216930546/1658567.png"></div><p> 紫外可見分光光度計的比色皿的洗滌方法 </p> <p> 1分光光度法中比色皿潔凈與否是影響測定準確度的因素之一。因此，必須重視選擇正確的洗凈方法。 </p> <p> 俺的經驗是：要是你測定溶液是酸，如果不干凈，就用弱堿溶液洗，要是你測定溶液是堿，如果不干凈，就用弱酸溶液洗，要是你測定溶液是有機物質，如果不干凈，就用有機溶劑，比如酒精等溶液洗。 </p> <p> 2選擇比色皿洗滌液的原則是去污效果好，不損壞比色皿，同時又不影響測定。 </p> <p> 2.1分析常用的鉻酸洗液不宜用于洗滌比色皿，這是因為帶水的比色皿在該洗液中有時會局部發(fā)熱，致使比色皿膠接面裂開而損壞。同時經洗液洗滌后的比色皿還很可能殘存微量鉻，其在紫外區(qū)有吸收，因此會影響鉻及其他有關元素的測定。 </p> <p> 一般主張使用硝酸和過氧化氫(5：1)的混合溶液泡洗，然后用水沖洗干凈。對一般方法難以洗凈的比色皿，還可以采取以下兩種方法。 </p> <p> 2.2先將比色皿侵入含有少量陰離子表面活性劑的碳酸鈉(20克/升)溶液泡洗，經水沖洗后，再于過氧化氫和硝酸(5：1)混合溶液中侵泡半小時。一般來說，紫外光分光光度計分為單光束和雙光束兩類。水質紫外可見分光光度計排行</p><p style="text-indent:25px">紫外分光光度法是根據物質的吸收光譜，來研究物質的成分、結構和物質間相互作用的有效手段。司法檢測紫外可見分光光度計廠家供應</p><p style="text-indent:25px">經過幾十年的發(fā)展，我國已經成為世界上第二大儀器儀表制造國，儀器儀表產業(yè)形成了一定的規(guī)模，儀器儀表產品也比較豐富。目前，分光光度計，氣相色譜，原子吸收，食品安全等產品的產量居世界前列，實驗分析儀器等中產品的市場占比不斷上升，行業(yè)技術上總體已達到的中等國際水平，少數產品接近或達到當前較高國際水平。目前我國儀器儀表、電子元器件及相關的系統集成的生產、服務及銷售，計算機軟件開發(fā)及銷售，從事貨物進出口及技術進出口業(yè)務。【依法須經批準的項目，經相關部門批準后方可開展經營活動】儀器儀表、電子元器件及相關的系統集成的生產、服務及銷售，計算機軟件開發(fā)及銷售，從事貨物進出口及技術進出口業(yè)務。【依法須經批準的項目，經相關部門批準后方可開展經營活動】產品，主要集中在中低檔市場，而市場則主要被國外品牌所占據。在某些領域，國產產品甚至是空白，這就需要未來我國儀器儀表向市場進軍，擴大產品占比。儀器儀表在工業(yè)發(fā)展中具有重要作用，這也使得儀器儀表得到快讀發(fā)展。各行各業(yè)對儀器儀表的市場需求也在不斷提升，銷售企業(yè)正在發(fā)展中尋求技術創(chuàng)新和質量提升。儀器儀表的質量、性能關系到工業(yè)安全，必須重視。司法檢測紫外可見分光光度計廠家供應</p><p style="text-indent:25px">上海儀電分析儀器有限公司總部位于徐塘路88號7幢4層、9幢，是一家儀器儀表、電子元器件及相關的系統集成的生產、服務及銷售，計算機軟件開發(fā)及銷售，從事貨物進出口及技術進出口業(yè)務。【依法須經批準的項目，經相關部門批準后方可開展經營活動】儀器儀表、電子元器件及相關的系統集成的生產、服務及銷售，計算機軟件開發(fā)及銷售，從事貨物進出口及技術進出口業(yè)務?！疽婪毥浥鷾实捻椖?，經相關部門批準后方可開展經營活動】的公司。儀電分析擁有一支經驗豐富、技術創(chuàng)新的專業(yè)研發(fā)團隊，以高度的專注和執(zhí)著為客戶提供分光光度計，氣相色譜，原子吸收，食品安全。儀電分析致力于把技術上的創(chuàng)新展現成對用戶產品上的貼心，為用戶帶來良好體驗。儀電分析始終關注儀器儀表行業(yè)。滿足市場需求，提高產品價值，是我們前行的力量。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/1914825.html</p></div></div></div></div></div><div id="i3u3ebs" class="page-right twoColRt"><div id="z3jdzyz" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="jyvxugd" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" alt="福建ZF配件哪家強信息推薦自業(yè)物資供應" class="vcenter" 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