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			<h2 style="padding:5px 0;">凯氏定氮仪校准方法</h2>
			
	          <p><span><strong>新闻类别：</strong>技术信息 &nbsp;&nbsp;<strong>查看次数：</strong>270459次&nbsp;&nbsp;<strong>时间：</strong>2016/11/14 15:52:36</span></p>
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				<p class="MsoNormal" style="font-family:Arial, Helvetica, sans-serif;background-color:#FFFFFF;">
	<span style="font-size:14px;font-family:'Microsoft YaHei';">首先我们讲<a href="http://www.yihonyiqi.com/" target="_blank"><strong><span style="color:#FF9900;">凯氏定氮仪原理</span></strong></a>的适用范围：凯氏定氮仪适用于食品、饮料、医药、农林渔业、矿山、化工等生产企业，以及高等院校、科研院所、环境监测、土肥站、农机站、质量监督检验等科研检测单位对食品、乳制品、天然橡胶、乳胶、种子、土壤、植株、饲料、矿石、污泥及化学沉淀物等样品中对蛋白质含量的智能化测定。</span> 
</p>
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	<br />
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<p class="MsoNormal" style="font-family:Arial, Helvetica, sans-serif;background-color:#FFFFFF;">
	<span style="font-size:14px;font-family:'Microsoft YaHei';">了解凯氏定氮仪的适用范围后，我们在使用凯氏定氮仪的过程中，如何鉴定仪器的可靠性或则如何校准凯氏定氮仪？</span> 
</p>
<p class="MsoNormal" style="font-family:Arial, Helvetica, sans-serif;background-color:#FFFFFF;">
	<span style="font-size:14px;font-family:'Microsoft YaHei';"></span> 
</p>
<p class="MsoNormal" style="font-family:Arial, Helvetica, sans-serif;background-color:#FFFFFF;">
	<span style="font-size:14px;font-family:'Microsoft YaHei';">下面重点阐述校准方法：</span> 
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	<span style="font-size:14px;font-family:'Microsoft YaHei';">使用过凯氏定氮仪的老师一定知道硫酸铵，硫酸铵是不需要消解，可以直接使用<a href="http://www.yihonyiqi.com/" target="_blank"><strong><span style="color:#FF9900;">凯氏定氮仪蒸馏装置</span></strong></a>蒸馏、滴定、出氮含量结果的，所以给校准工作带来了极大的方便。值得注意的是：</span><span style="font-size:14px;font-family:'Microsoft YaHei';">1</span><span style="font-size:14px;font-family:'Microsoft YaHei';">、选择（分析纯）高纯度硫酸铵&nbsp;</span><span style="font-size:14px;font-family:'Microsoft YaHei';">2</span><span style="font-size:14px;font-family:'Microsoft YaHei';">、硫酸铵需要在</span><span style="font-size:14px;font-family:'Microsoft YaHei';">105</span><span style="font-size:14px;font-family:'Microsoft YaHei';">℃左右的高温下进行长达</span><span style="font-size:14px;font-family:'Microsoft YaHei';">2</span><span style="font-size:14px;font-family:'Microsoft YaHei';">小时的烘干处理。</span> 
</p>
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	<br />
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<p class="MsoNormal" style="font-family:Arial, Helvetica, sans-serif;background-color:#FFFFFF;">
	<span style="font-size:14px;font-family:'Microsoft YaHei';">校准步骤：（我们按照</span><span style="font-size:14px;font-family:'Microsoft YaHei';">4</span><span style="font-size:14px;font-family:'Microsoft YaHei';">个样品为例）</span> 
</p>
<p class="MsoNormal" style="font-family:Arial, Helvetica, sans-serif;background-color:#FFFFFF;">
	<br />
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<p class="MsoNormal" style="font-family:Arial, Helvetica, sans-serif;background-color:#FFFFFF;">
	<span style="font-size:14px;font-family:'Microsoft YaHei';">1、万分之一天平一台</span><span></span> 
</p>
<p class="MsoNormal" style="font-family:Arial, Helvetica, sans-serif;background-color:#FFFFFF;">
	<span style="font-size:14px;font-family:'Microsoft YaHei';">称量烘干的硫酸铵样品（分析纯），样品称量范围与标准酸滴定浓度有关系的。比如我们的标准酸浓度为</span><span style="font-size:14px;font-family:'Microsoft YaHei';">0. 173mol/L</span><span style="font-size:14px;font-family:'Microsoft YaHei';">，称量硫酸铵</span><span style="font-size:14px;font-family:'Microsoft YaHei';">0.1g</span><span style="font-size:14px;font-family:'Microsoft YaHei';">左右即可（精确到小数点后</span><span style="font-size:14px;font-family:'Microsoft YaHei';">4</span><span style="font-size:14px;font-family:'Microsoft YaHei';">位）</span> 
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<p class="MsoNormal" style="font-family:Arial, Helvetica, sans-serif;background-color:#FFFFFF;">
	<span style="font-size:14px;font-family:'Microsoft YaHei';">2、</span><span style="font-size:14px;font-family:'Microsoft YaHei';">NKY6120</span><span style="font-size:14px;font-family:'Microsoft YaHei';">颜色法凯氏定氮仪为例：（半自动手动滴定这里不举例了）</span> 
</p>
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	<br />
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<p class="MsoNormal" style="font-family:Arial, Helvetica, sans-serif;background-color:#FFFFFF;">
	<span style="font-size:14px;font-family:'Microsoft YaHei';">蒸馏滴定：&nbsp;选择边蒸馏边滴定模式，加稀释水</span><span style="font-size:14px;font-family:'Microsoft YaHei';">15ml,</span><span style="font-size:14px;font-family:'Microsoft YaHei';">硼酸</span><span style="font-size:14px;font-family:'Microsoft YaHei';">30ml,40%</span><span style="font-size:14px;font-family:'Microsoft YaHei';">氢氧化钠</span><span style="font-size:14px;font-family:'Microsoft YaHei';">40ml</span><span style="font-size:14px;font-family:'Microsoft YaHei';">，蒸馏</span><span style="font-size:14px;font-family:'Microsoft YaHei';">5min</span><span style="font-size:14px;font-family:'Microsoft YaHei';">。</span> 
</p>
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	<br />
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				<p class="MsoNormal" style="text-indent:48pt;">
					<span style="font-size:14px;font-family:'Microsoft YaHei';">样品</span><span></span> 
				</p>
				<p class="MsoNormal" style="text-indent:18pt;">
					<span style="font-size:14px;font-family:'Microsoft YaHei';">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;编号</span><span></span> 
				</p>
			</td>
			<td width="182" valign="top" style="font-family:Arial, Helvetica, sans-serif;">
				<p class="MsoNormal">
					<span style="font-size:14px;font-family:'Microsoft YaHei';">硫酸铵（</span><span style="font-size:14px;font-family:'Microsoft YaHei';">g</span><span style="font-size:14px;font-family:'Microsoft YaHei';">）</span><span></span> 
				</p>
			</td>
			<td width="280" valign="top" style="font-family:Arial, Helvetica, sans-serif;">
				<p class="MsoNormal">
					<span style="font-size:14px;font-family:'Microsoft YaHei';">氮含量</span><span style="font-size:14px;font-family:'Microsoft YaHei';">%</span> 
				</p>
			</td>
		</tr>
		<tr>
			<td width="161" valign="top" style="font-family:Arial, Helvetica, sans-serif;">
				<p class="MsoNormal">
					<span style="font-size:14px;font-family:'Microsoft YaHei';">1</span> 
				</p>
			</td>
			<td width="182" valign="top" style="font-family:Arial, Helvetica, sans-serif;">
				<p class="MsoNormal">
					<span style="font-size:14px;font-family:'Microsoft YaHei';">0.0872</span> 
				</p>
			</td>
			<td width="280" valign="top" style="font-family:Arial, Helvetica, sans-serif;">
				<p class="MsoNormal">
					<span style="font-size:14px;font-family:'Microsoft YaHei';">21.0099</span> 
				</p>
			</td>
		</tr>
		<tr>
			<td width="161" valign="top" style="font-family:Arial, Helvetica, sans-serif;">
				<p class="MsoNormal">
					<span style="font-size:14px;font-family:'Microsoft YaHei';">2</span> 
				</p>
			</td>
			<td width="182" valign="top" style="font-family:Arial, Helvetica, sans-serif;">
				<p class="MsoNormal">
					<span style="font-size:14px;font-family:'Microsoft YaHei';">0.0803</span> 
				</p>
			</td>
			<td width="280" valign="top" style="font-family:Arial, Helvetica, sans-serif;">
				<p class="MsoNormal">
					<span style="font-size:14px;font-family:'Microsoft YaHei';">21.1381</span> 
				</p>
			</td>
		</tr>
		<tr>
			<td width="161" valign="top" style="font-family:Arial, Helvetica, sans-serif;">
				<p class="MsoNormal">
					<span style="font-size:14px;font-family:'Microsoft YaHei';">3</span> 
				</p>
			</td>
			<td width="182" valign="top" style="font-family:Arial, Helvetica, sans-serif;">
				<p class="MsoNormal">
					<span style="font-size:14px;font-family:'Microsoft YaHei';">0.0998</span> 
				</p>
			</td>
			<td width="280" valign="top" style="font-family:Arial, Helvetica, sans-serif;">
				<p class="MsoNormal">
					<span style="font-size:14px;font-family:'Microsoft YaHei';">21.0562</span> 
				</p>
			</td>
		</tr>
		<tr>
			<td width="161" valign="top" style="font-family:Arial, Helvetica, sans-serif;">
				<p class="MsoNormal">
					<span style="font-size:14px;font-family:'Microsoft YaHei';">4</span> 
				</p>
			</td>
			<td width="182" valign="top" style="font-family:Arial, Helvetica, sans-serif;">
				<p class="MsoNormal">
					<span style="font-size:14px;font-family:'Microsoft YaHei';">0.0868</span> 
				</p>
			</td>
			<td width="280" valign="top" style="font-family:Arial, Helvetica, sans-serif;">
				<p class="MsoNormal">
					<span style="font-size:14px;font-family:'Microsoft YaHei';">21.1424</span> 
				</p>
			</td>
		</tr>
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<p class="MsoNormal" style="font-family:Arial, Helvetica, sans-serif;background-color:#FFFFFF;">
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<p class="MsoNormal" style="font-family:Arial, Helvetica, sans-serif;background-color:#FFFFFF;">
	<span style="font-size:14px;font-family:'Microsoft YaHei';">校准硫酸铵的参考值为</span><span style="font-size:14px;font-family:'Microsoft YaHei';">21.19</span><span style="font-size:14px;font-family:'Microsoft YaHei';">±</span><span style="font-size:14px;font-family:'Microsoft YaHei';">0.2</span><span style="font-size:14px;font-family:'Microsoft YaHei';">，所以参考值一般在</span><span style="font-size:14px;font-family:'Microsoft YaHei';">20.99%----21.39</span><span style="font-size:14px;font-family:'Microsoft YaHei';">之间。</span> 
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