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制药用水TOC分析仪 纯水总有机碳分析仪  紫外法

    紫外吸收光谱用于TOC的检测分析最早可追溯到1972年,Dobbs等人对于254nm处紫外吸光度值(A)和城市污水处理二级出水及河水的TOC之间线性关系进行了研究。经过几十年的发展,由于具有快速、不接触测量、重复性好、维护量少等优点，该方法的应用得到飞速发展。

制药用水TOC分析仪 纯水总有机碳分析仪  差减法测定TOC值的方法原理

水样分别被注入高温燃烧管(900℃)和低温反应管(150℃)中。经高温燃烧管的水样受高温催化氧化，使有机化合物和无机碳酸盐均转化成为二氧化碳。经反应管的水样受酸化而使无机碳酸盐分解成为二氧化碳，其所生成的二氧化碳依次导入非分散红外检测器，从而分别测得水中的总碳(TC)和无机碳(IC)。总碳与无机碳之差值，即为总有机碳(TOC)。

Offline detection

During off-line detection, the instrument can directly sample from the sample bottle or other containers without pressure. Instrument pipeline flushing and instrument calibration shall be operated offline. If there are insoluble particles in the sample, it shall pass through the filter membrane (pore size 60 μ M U.M or less) to prevent particles in the sample from blocking the instrument. The sampling tube of the instrument is a 1 / 16 inch Teflon tube, and the flow rate of water sample pumped into the pipeline by the peristaltic pump is about 0.5 ml / min.

性能规格:

◆测量范围：0.01mg/L～1.000 mg/L（此处可调）

◆精 度：?4%测试范围

◆分 辨 率：0.001mg /L

◆分析时间：连续分析

◆响应时间：6分钟之内

◆检测极限：0.001mg /L

◆样品温度：1- 95℃

◆重复性误差：≤ 3%

◆电源要求/功能：220V

◆显 示 屏：彩色触摸屏

◆操作控制：无线蓝牙技术；

Environmental requirements

The instrument shall be operated in a constant temperature and humidity environment suitable for operation. Avoid direct sunlight and abnormal temperature; Too high temperature (over 104 ? F, 40 ? C) will lead to abnormal operation, and too low temperature (below 50 ? F, 10 ? C) will lead to excessive measurement error.

电阻法

该法是近年来开始应用的技术,其原理是在温度补偿前提下,测量样品在紫外线氧化前后电阻率的差值来实现的。但该方法对被测量的水体来源要求比较苛刻,只能用相对洁净的工业用水和纯水,应用方向单一。

Carbon dioxide sensor

Two carbon dioxide sensors are installed on the instrument, which are composed of conductivity sensor and temperature sensor. The conductivity measurement adopts double precision technology, which can realize automatic calibration and temperature compensation. The tic sensor is used to detect the concentration of carbon dioxide in the non oxidized water sample and detect the conductivity value of the water sample; TC sensor is used to detect the sum of the carbon dioxide contained in the water sample itself and the carbon dioxide concentration generated by the decomposition of organic matter in the water sample.

使用与操作方法

开始检测并计入检测次数，检测完毕后显示最后一次检测结果，其中几次检测的结果均自动保存在查询记录当中。检测次数的设置方式为：用“选择”键移动光标，用“设置”键修改数字，按“确定”键进行确认，进入分析界面。先进行四次冲洗过程

Analysis steps of TOC in water samples

1. Reagent preparation

(1) Potassium hydrogen phthalate (khc8h4o4): Reference Reagent

(2) Anhydrous sodium carbonate: Reference Reagent

(3) Sodium bicarbonate: Reference Reagent

(4) Carbon dioxide free distilled water

2. Preparation of standard stock solution

(1) Organic carbon standard stock solution: weigh an appropriate amount of khc8h4o4 after drying and dilute it with water. Generally, the concentration of stock solution is 400mg / L carbon.

(2) Inorganic carbon standard stock solution: weigh appropriate proportion of sodium carbonate and sodium bicarbonate after drying, dilute with water, and generally the concentration of the stock solution is 400mg / L inorganic carbon.

总有机碳（TOC）分析仪是北京北广精仪仪器设备有限公司独立研制的专利产品，用于测定水样中总有机碳的浓度，具有高灵敏度和精确度。

TOC分析仪可以检测TOC浓度从0.001mg/L到1.000mg/L的水样。本产品操作简单，维护费用低，无需添加化学试剂，操作人员无需特殊培训或专业化学知识。

3. Preparation of organic carbon and inorganic carbon standard solutions

Diluted from the respective stock solutions as required.

4. Drawing of calibration curve

Dilute the standard solution step by step into organic carbon and inorganic carbon standard solutions with different concentrations, inject them into the combustion tube and reaction tube respectively, measure the absorption peak height on the recorder, plot the corresponding concentration and draw the calibration curve.

二氧化碳测量循环

仪器每4分钟检测得出一个数据（包括TOC值和电导率值），在4分钟的测量循环中TC和TIC是独立检测的。

5. Water sample determination

Take a proper amount of water sample and inject it into TOC instrument for determination. The peak height obtained can read the corresponding concentration from the standard curve, or the instrument can automatically calculate the result.

在线检测装置

进入仪器内部后水样的流速大约为0.5 ml/min。进入在线检测装置的水样温度可以在1～95℃范围内，仪器的废液和在线检测装置的排出液均由排液管排出。

6. Calculation

Subtraction method: total organic carbon (mg / L) = total carbon - inorganic carbon

Direct method: total organic carbon (mg / L) = total carbon

试剂准备

(1)邻苯二甲酸氢钾(KHC8H4O4)：基准试剂

(2)无水碳酸钠：基准试剂

(3)碳酸氢钠：基准试剂

(4)无二氧化碳蒸馏水

附件：

试验主机一台

采集管两条

电源线一条

控制系统一套

数据采集系统一套

产品使用说明书一份

产品合格证、保修卡一份

折叠电导率检测法

　　TOC电导率检测技术能够测量液态的CO2。业界采用的主要有两种电导率检测技术:一种是直接电导率法，另外一种是薄膜电导率检测法(又称选择性电导率法)。采用两种电导率法的TOC分析仪校验结果都很稳定，检测精度高。这两种技术最主要的区别在于，直接电导率法比较容易受杂酸性，卤化有机物等的干扰;而薄膜电导率检测技术抗干扰性更佳。

　　薄膜电导率检测法是GE TOC分析仪使用较多的检测方法，TOC分析仪使用的膜能防止杂离子的通过，确保检测的只是CO2的含量，从而使TOC的读数更为精确。

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