上海標(biāo)準品哪家便宜創(chuàng)造輝煌深圳振強生物技術(shù)供應(yīng)-b2b網(wǎng)站_b2b電子商務(wù)平臺【買產(chǎn)品】-上?？谄蚴称酚邢薰?/title><meta name="description" content="對于標(biāo)準品當(dāng)大量棕色沉淀生成，高錳酸鉀的紫色變淺或消失，甲苯層消失時，反應(yīng)基本結(jié)束。過濾出二氧化錳沉淀，濾液用濃鹽酸酸化，析出苯甲酸的沉淀，抽濾得粗產(chǎn)品。粗產(chǎn)品用水重結(jié)晶。在沸水浴上干燥，稱量，測其熔點。工業(yè)上常用甲苯、鄰二甲苯或萘為原料制"><meta name="keywords" content="上海標(biāo)準品哪家便宜,標(biāo)準品"><link rel="canonical" href="http://www.cdcfah.com/"/><meta name="applicable-device" content="pc"><link rel="shortcut icon" href="/static/new_net_01/images/favicon.ico"><link rel="stylesheet" href="/static/new_net_01/css/slick.css" /><link rel="stylesheet" href="/static/new_net_01/css/addnew.css"><link rel="stylesheet" href="/static/new_net_01/css/sidenav.css"><link rel="stylesheet" href="/static/new_net_01/css/style.css" /><link rel="stylesheet" href="/static/new_net_01/css/tab.css"><link rel="stylesheet" href="/static/new_net_01/css/404.css"> <meta name="baidu-site-verification" content="OBVzrC9aaQ" /> <meta 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href="http://www.cdcfah.com/cp/third-hgzjt_yyzjtic/">醫(yī)藥中間體</a>?上海標(biāo)準品哪家便宜創(chuàng)造輝煌深圳振強生物技術(shù)供應(yīng)</p><div id="kry8z8k" class="leftbox clearfix"><h1>上海標(biāo)準品哪家便宜創(chuàng)造輝煌深圳振強生物技術(shù)供應(yīng)</h1><div id="jtqf7oh" class="proBig"><div id="2ys8fco" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/SZZQSW/637352820385185547/5584221.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="iczy7e7" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/SZZQSW/637352820385185547/5584221.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="mgyv4r9" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</span>面議</p><p><span>所在地：</span>廣東省</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>上海標(biāo)準品哪家便宜,標(biāo)準品</p><p><span>***更新：</span>2021-02-06 04:24:43</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="edv87l4" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">深圳振強生物技術(shù)有限公司</a></p><p><span>聯(lián)系人：</span>顏佳</p><p><span>郵箱: </span>450804601@qq.com</p><p><span>電話: </span>15920483169</p><p><span>傳真: </span>0755_</p><p><span>網(wǎng)址: </span>http://www.chem-strong.com</p><p><span>手機: </span>0755-66853366</p><p><span>地址: </span>龍崗街道南聯(lián)社區(qū)碧新路(龍崗段)2055號1201</p><p>[當(dāng)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="utlnc78" class="page-proshow02"><p class="title">詳細說明</p><div id="xbtqf4v" class="box"><p><p style="text-indent:25px">對于標(biāo)準品當(dāng)大量棕色沉淀生成，高錳酸鉀的紫色變淺或消失，甲苯層消失時，反應(yīng)基本結(jié)束。過濾出二氧化錳沉淀，濾液用濃鹽酸酸化，析出苯甲酸的沉淀，抽濾得粗產(chǎn)品。粗產(chǎn)品用水重結(jié)晶。在沸水浴上干燥，稱量，測其熔點。工業(yè)上常用甲苯、鄰二甲苯或萘為原料制備苯甲酸，上述原料可從煤焦油或石油中獲得，上海標(biāo)準品哪家便宜。此外，由甲苯生產(chǎn)苯甲醛時可副產(chǎn)苯甲酸。苯甲酸的工業(yè)生產(chǎn)方法有甲苯氯化法，上海標(biāo)準品哪家便宜、鄰苯二甲酸脫、羧法甲苯液相空氣氧化法，上海標(biāo)準品哪家便宜、次芐基三氯水解法及苯酐脫羧法。標(biāo)準品冷凍干燥對它的濃度和免疫活性無明顯的影響。上海標(biāo)準品哪家便宜</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="上海標(biāo)準品哪家便宜,標(biāo)準品" src="https://tyunfile.71360.com/UploadFile/SZZQSW/637352820385185547/5584221.png"></div><p> 6、滴定液的標(biāo)定和復(fù)標(biāo)： </p> <p> 滴定液配制、標(biāo)定方法按藥典執(zhí)行。一般由一人標(biāo)定，第二人復(fù)標(biāo)，標(biāo)定須作平行標(biāo)定，并不得少于3次，且其結(jié)果的相對偏差不得超過0.1%。標(biāo)定和復(fù)標(biāo)二結(jié)果的相對偏差不得超0.15%，否則重標(biāo)，如標(biāo)定和復(fù)標(biāo)誤差符合要求，則將二者的算術(shù)平均值作為滴定結(jié)果。 </p> <p> 復(fù)標(biāo)合格的滴定液及配制好的標(biāo)準溶液，須貼上標(biāo)簽，寫明品名、濃度，配制日期、標(biāo)定日期、溫度、標(biāo)定人、復(fù)標(biāo)人、使用效期等。滴定液應(yīng)定期復(fù)標(biāo)，其使用期限一般為3個月。 </p> <p> 超過期限不得使用。滴定液與標(biāo)準液應(yīng)按《中國藥典》要求貯存，對光易變化的滴定液、標(biāo)準液應(yīng)貯于棕色瓶中，瓶口捆扎塑膜防潮、防污染，由專人保管。超過使用期限的標(biāo)準液及滴定液，保管員不得發(fā)放，使用人員不得使用。上海標(biāo)準品哪家便宜標(biāo)準品應(yīng)驗收并記錄標(biāo)準品名稱、標(biāo)物編號、批次號。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="上海標(biāo)準品哪家便宜,標(biāo)準品" src="https://tyunfile.71360.com/UploadFile/SZZQSW/637352820609003907/8690665.png"></div><p style="text-indent:25px">標(biāo)準品稱量、稀釋過程中使用的計量器具，如天平、移液器、容量瓶等，應(yīng)經(jīng)適當(dāng)?shù)男驶驒z定確認符合精度和準確度要求，特別是有機分析中使用的微量注射器和移液裝置的誤差較大，應(yīng)注重進行日常校準。如無特殊情況，工作標(biāo)準品的含量每半年復(fù)標(biāo)一次或另取新生產(chǎn)的樣品標(biāo)定。當(dāng)標(biāo)準品暫不使用時，復(fù)標(biāo)周期可能超過規(guī)定周期，在使用前進行復(fù)標(biāo)，合格后可以繼續(xù)使用。對于特定市場使用的工作標(biāo)準品，復(fù)標(biāo)可以按照當(dāng)?shù)厮幷只蛘咚幍涞囊?guī)定的周期來進行。</p><p style="text-indent:25px">標(biāo)準品當(dāng)給出截止日期時，證書則包含著保證：在證書規(guī)定的有效期內(nèi)，標(biāo)準值將會在適當(dāng)間隔的時間內(nèi)進行監(jiān)測，在有效期內(nèi)，CRM發(fā)生的重大變化導(dǎo)致重新定值或?qū)⑵涑蜂N，均將告知購買者。甚至當(dāng)沒有給出截至日期時，標(biāo)準值在適當(dāng)期間內(nèi)發(fā)生了非預(yù)期的變化，也應(yīng)當(dāng)告知購買者。當(dāng)測量方法有所改進時，也可能重新進行再定值。因此，生產(chǎn)者和銷售者應(yīng)當(dāng)保留購買者的名錄。當(dāng)?shù)竭_證書的截至日期后，測量顯示標(biāo)準值沒有改變，這時應(yīng)當(dāng)發(fā)布標(biāo)準值不變的，但有新截止日期的新證書，新的截止日期是根據(jù)上次證書給出的有效期內(nèi)證明的穩(wěn)定性而定的。標(biāo)準品有確定特性量的值。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="上海標(biāo)準品哪家便宜,標(biāo)準品" src="https://tyunfile.71360.com/UploadFile/SZZQSW/637352820657851563/5647069.png"></div><p style="text-indent:25px">正確使用標(biāo)準品/標(biāo)準樣品的說明標(biāo)準品/標(biāo)準樣品必須在證書規(guī)定的條件下使用。例如：若干燥處理，應(yīng)當(dāng)給出準確條件，如，105℃下2個小時。容器有時也需要在規(guī)定條件下打開。例如，存儲在低于環(huán)境溫度的標(biāo)準品/標(biāo)準樣品，在容器打開前，應(yīng)當(dāng)加熱到實驗室溫度，以避免水蒸氣凝結(jié)引起污染；儲存在惰性氣體中的標(biāo)準品/標(biāo)準樣品，標(biāo)準品/標(biāo)準樣品只應(yīng)當(dāng)在含有相似惰性氣體的手套箱中打開。在這種情況下，應(yīng)當(dāng)給出適當(dāng)?shù)木尽３窃谧C書中有規(guī)定。標(biāo)準品的帳面管理一定要做好。上海標(biāo)準品哪家便宜</p><p style="text-indent:25px">標(biāo)準品一次決定，使用完為止。上海標(biāo)準品哪家便宜</p><p style="text-indent:25px">由單獨實驗室或測量方法獲得的值當(dāng)用幾種方法測定標(biāo)準品/標(biāo)準樣品時，每一種方法都應(yīng)當(dāng)加以說明。對于通用方法，則提及即可，例如，原子吸收法或X-射線熒光廣譜法。但是，當(dāng)使用非標(biāo)準方法或經(jīng)修改的標(biāo)準方法時，應(yīng)當(dāng)給出參考文獻或完整的描述。當(dāng)幾個單獨的實驗室或單獨的分析者對標(biāo)準品/標(biāo)準樣品的測量有貢獻時，其名稱及其使用的方法應(yīng)當(dāng)一并給出。每個方法得到的特性量值以及不同實驗室或分析者使用相同方法得到的特性值，在一些情況下也可以分別列出。上海標(biāo)準品哪家便宜</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/3186017.html</p></div></div></div></div></div><div id="mwyvs4i" class="page-right twoColRt"><div id="po82ifm" 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