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p_dataSource borderB_dividers"> <li><span><span class="i_sort">分類：</span></span><a href=''>甲醛檢測</a></li>  <li><span><span class="i_date">發布時間：</span></span>2021-12-09 15:08:30</li> <li><span><span class="i_pv">訪問量：</span></span><span class="p_viewCount">0</span></li> </ul> <div class="e_box p_summary summary-mo color_minor borderB_bar"> <span><span class="i_summary">概要:</span></span> </div> <div class="e_box p_summary summary-pc color_minor"> <span><span class="i_summary">概要:</span></span> </div> <div class="e_HtmlEditor p_content"> <div class="e_title p_tit borderB_dividers"><span class="i_detailTitle">詳情</span></div> <div class="e_box p_con"><p style="text-align: center;"><span style="font-size:26px;"><strong>甲醛檢測方法</strong></span></p> <p> </p> <p><span style="font-size:16px;">深圳甲醛檢測中心：檢測甲醛需要了解甲醛，本篇深圳偉華環保為您分享甲醛的定義及最常用甲醛檢測方法及原理</span></p> <p><span style="font-size:16px;"><strong>深圳偉華環保（一）：甲醛的定義：</strong></span></p> <p><span style="font-size:16px;">甲醛化學分子式HCHO，分子量：30.03,是一種無色,有強烈刺激性氣味的氣體。易溶于水、醇醚。甲醛在常溫下是氣態，通常以水溶液形式出現。40%的水溶液為福爾馬林，此溶液沸點為19℃。故在室溫時極易揮發，隨著溫度的上升揮發速度加快。</span></p> <p><span style="font-size:16px;"><strong>深圳偉華環保（二）：甲醛檢測方法及原理</strong></span></p> <p><span style="font-size:16px;">方法1、酚試劑分光光度法 </span></p> <p><span style="font-size:16px;">原理：本方法主要依據GB/T18204.26《公共場所空氣中甲醛測定方法》空氣中的甲醛與酚試劑反應生成嗪，嗪在酸性溶液中被高鐵離子氧化形成藍綠色化合物。根據顏色深淺，比色定量。測定范圍為 0.1～1.5µg，采樣體積為10L時，可測濃度范圍 0.01～0.15 mg/m3。</span></p> <p><span style="font-size:16px;">方法2、氣相色譜法 </span></p> <p><span style="font-size:16px;">原理：本方法主要依據GB/T18204.26《公共場所空氣中甲醛測定方法》。空氣中甲醛在酸性條件下吸附在涂有2，4-二硝基苯肼（2，4-DNPH）6201擔體上，生成穩定的甲醛腙。用二硫化碳洗脫后，經0V-色譜柱分離，用氫焰離子化檢測器測定，以保留時間定性，峰高（峰面積）定量。檢出下限為0.2µg/mL（進樣品洗脫液5μL）。</span></p> <p><span style="font-size:16px;">方法3、乙酰丙酮分光光度法</span></p> <p><span style="font-size:16px;">原理：本方法主要依據GB/T15516—1995《空氣質量甲醛的測定乙酰丙酮分光光度法》。甲醛氣體經水吸收后，在pH=6的乙酸-乙酸銨緩沖溶液中，與乙酰丙酮作用，在沸水浴條件下，迅速生成穩定的黃色化合物，在波長413nm處測定。本方法的檢出限為0.25µg，采樣體積為30L時，最低檢出濃度為0.008mg/m³。 </span></p> <p><span style="font-size:16px;">方法4、電化學傳感器法 </span></p> <p><span style="font-size:16px;">原理：由泵抽入的樣氣通過電化學傳感器，受擴散和吸收控制的甲醛氣體分子在適當的電極電壓下發生氧化反應，產生的擴散電流與空氣中甲醛的濃度成正比。本法可測濃度范圍為0～10mg/m3。最低檢測質量濃度0.01mg/m³。</span></p> <p><span style="font-size:16px;">深圳甲醛檢測中心總結：以上<strong>甲醛檢測方法</strong>各有優點，但是針對于家庭或者辦公場所檢測，深圳偉華環保推薦使用第一種甲醛檢測方法酚試劑分光光度法，其使用的器材主要有：</span></p> <p><span style="font-size:16px;">1、大型氣泡吸收管。</span></p> <p><span style="font-size:16px;">2、大氣采樣器：流量范圍0～1L/min（TQ-1000 雙氣路大氣采樣器）。流量穩定可調，恒流誤差小于2%。 </span></p> <p><span style="font-size:16px;">3、10mL具塞比色管。 </span></p> <p><span style="font-size:16px;">4、722s分光光度計。</span></p> <p background-color:="" font-size:="" microsoft="" white-space:=""><span style="font-size:16px;">酚試劑分光光度法的優點：其可測濃度范圍 0.01～0.15 mg/m3。</span></p> <p background-color:="" font-size:="" microsoft="" white-space:=""><span style="font-size:16px;">檢測結果準確，便于攜帶，適合檢測家庭或者公共辦公場所。</span></p> </div> </div> <div class="e_box p_assist"> <div class="e_box p_KeywordBox"> </div> </div> <div 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