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			<h2 style="padding:5px 0;">凯氏定氮-颜色法与伪颜色法（比色法）的区别</h2>
			
	          <p><span><strong>新闻类别：</strong>技术信息 &nbsp;&nbsp;<strong>查看次数：</strong>290550次&nbsp;&nbsp;<strong>时间：</strong>2016/12/14 22:33:13</span></p>
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	<span style="font-family:Microsoft YaHei;font-size:14px;"><span style="font-family:Microsoft YaHei;font-size:14px;">颜色法与伪颜色法（比色法）的区别：</span></span><span style="font-family:Calibri;font-size:10.5pt;"></span> 
</p>
<p class="MsoNormal">
	<span style="font-family:Calibri;font-size:10.5pt;"><span style="font-family:Microsoft YaHei;font-size:14px;">由于有些企业由于能力和成本原因，把比色法说成颜色法，这对用户选择带来了困惑，为此在此介绍如何来辨别二者的区别。避免</span><span style="font-family:Microsoft YaHei;font-size:14px;">“</span><span style="font-family:Microsoft YaHei;font-size:14px;">李鬼</span><span style="font-family:Microsoft YaHei;font-size:14px;">”</span><span style="font-family:Microsoft YaHei;font-size:14px;">附身。</span></span><span style="font-family:Calibri;font-size:10.5pt;"></span> 
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	<span style="font-family:Calibri;font-size:10.5pt;"><span style="font-family:Microsoft YaHei;font-size:14px;">1.</span><span style="font-family:Microsoft YaHei;font-size:14px;">滴定时到达终点，样品颜色发生变化，此时就认为滴定到终点。但是要注意的是：此时变化的是颜色（不仅仅是某波长的光通量的变化量，而要判断不同单色光相互关系）而不是单色光。如果用单色光</span><span style="font-family:Microsoft YaHei;font-size:14px;">(</span><span style="font-family:Microsoft YaHei;font-size:14px;">滤光片）比色而来判断，那毫无疑问数据是不可靠的，最大的问题是线性度差。</span></span><span style="font-family:Calibri;font-size:10.5pt;"></span> 
</p>
<p class="MsoNormal">
	<span style="font-family:Calibri;font-size:10.5pt;"><span style="font-family:Microsoft YaHei;font-size:14px;">2.</span><span style="font-family:Microsoft YaHei;font-size:14px;">单色光比色就像分光光度计一样需要避光，所以伪颜色法（比色法）的定氮仪他的光路是密闭的。使用者看不到光路、比色杯和反应样品。而颜色法本身是复合光，判断的依据是不同颜色的关系，所以对自然光的变化对判断影响是非常小的。所以您可以看到样品杯和光线，甚至可以看到光源。这对颜色法和伪颜色法提供了直观的选择依据。</span></span> 
</p>
<p class="MsoNormal">
	<span style="font-family:Calibri;font-size:10.5pt;"><span style="font-family:Microsoft YaHei;font-size:14px;"></span></span><img title="凯氏定氮仪" alt="凯氏定氮仪" src="/attached/image/20161202/20161202202599179917.jpg" width="854" height="565" /><span style="font-family:Calibri;font-size:10.5pt;"></span> 
</p>
<p class="MsoNormal">
	<span style="font-family:Calibri;font-size:10.5pt;"><span style="font-family:Microsoft YaHei;font-size:14px;">3.</span><span style="font-family:Microsoft YaHei;font-size:14px;">蒸馏和滴定的关系：颜色法都是蒸馏和滴定同时进行，直到蒸馏结束来最终判断终点。而伪颜色法（比色法）由于判断方式的原因只能蒸馏后再滴定。</span></span><span style="font-family:Calibri;font-size:10.5pt;"></span> 
</p>
<p class="MsoNormal">
	<span style="font-family:Microsoft YaHei;font-size:14px;"><span style="font-family:Microsoft YaHei;font-size:14px;">您如果依据以上三点来比较，不符合颜色法的原理的，那就坚决淘汰，而不去管其他参数如何精美，否则有可能陷入陷阱（用比色法来冒充颜色法本身就是能力和品质有问题，其他精美的参数都必须打个问号，在此不做讨论）。</span></span><span style="font-family:Calibri;font-size:10.5pt;"></span> 
</p>
<p class="MsoNormal">
	<span style="font-family:Microsoft YaHei;font-size:14px;"><span style="font-family:Microsoft YaHei;font-size:14px;">注意：比色法是早已淘汰的检测方法，更无检测标准的依据，而颜色法是目前全自动定氮仪检测的主流方法，且为各类检测标准所接受。</span></span> 
</p>
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	<span style="font-family:Microsoft YaHei;font-size:14px;"><span style="font-family:Microsoft YaHei;font-size:14px;"></span></span>&nbsp;
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	<span style="font-family:Microsoft YaHei;font-size:14px;"><span style="font-family:Microsoft YaHei;font-size:14px;"></span></span><span style="font-family:Calibri;font-size:10.5pt;"></span>&nbsp;
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