產(chǎn)品

制藥用水TOC分析儀 純水總有機(jī)碳分析儀  紫外法

    紫外吸收光譜用于TOC的檢測分析最早可追溯到1972年,Dobbs等人對于254nm處紫外吸光度值(A)和城市污水處理二級出水及河水的TOC之間線性關(guān)系進(jìn)行了研究。經(jīng)過幾十年的發(fā)展,由于具有快速、不接觸測量、重復(fù)性好、維護(hù)量少等優(yōu)點，該方法的應(yīng)用得到飛速發(fā)展。

制藥用水TOC分析儀 純水總有機(jī)碳分析儀  差減法測定TOC值的方法原理

水樣分別被注入高溫燃燒管(900℃)和低溫反應(yīng)管(150℃)中。經(jīng)高溫燃燒管的水樣受高溫催化氧化，使有機(jī)化合物和無機(jī)碳酸鹽均轉(zhuǎn)化成為二氧化碳。經(jīng)反應(yīng)管的水樣受酸化而使無機(jī)碳酸鹽分解成為二氧化碳，其所生成的二氧化碳依次導(dǎo)入非分散紅外檢測器，從而分別測得水中的總碳(TC)和無機(jī)碳(IC)?？偺寂c無機(jī)碳之差值，即為總有機(jī)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.

性能規(guī)格:

◆測量范圍：0.01mg/L～1.000 mg/L（此處可調(diào)）

◆精 度：?4%測試范圍

◆分 辨 率：0.001mg /L

◆分析時間：連續(xù)分析

◆響應(yīng)時間：6分鐘之內(nèi)

◆檢測極限：0.001mg /L

◆樣品溫度：1- 95℃

◆重復(fù)性誤差：≤ 3%

◆電源要求/功能：220V

◆顯 示 屏：彩色觸摸屏

◆操作控制：無線藍(lán)牙技術(shù)；

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.

電阻法

該法是近年來開始應(yīng)用的技術(shù),其原理是在溫度補(bǔ)償前提下,測量樣品在紫外線氧化前后電阻率的差值來實現(xiàn)的。但該方法對被測量的水體來源要求比較苛刻,只能用相對潔凈的工業(yè)用水和純水,應(yīng)用方向單一。

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.

使用與操作方法

開始檢測并計入檢測次數(shù)，檢測完畢后顯示最后一次檢測結(jié)果，其中幾次檢測的結(jié)果均自動保存在查詢記錄當(dāng)中。檢測次數(shù)的設(shè)置方式為：用“選擇”鍵移動光標(biāo)，用“設(shè)置”鍵修改數(shù)字，按“確定”鍵進(jìn)行確認(rèn)，進(jìn)入分析界面。先進(jìn)行四次沖洗過程

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.

總有機(jī)碳（TOC）分析儀是北京北廣精儀儀器設(shè)備有限公司獨(dú)立研制的專利產(chǎn)品，用于測定水樣中總有機(jī)碳的濃度，具有高靈敏度和精確度。

TOC分析儀可以檢測TOC濃度從0.001mg/L到1.000mg/L的水樣。本產(chǎn)品操作簡單，維護(hù)費(fèi)用低，無需添加化學(xué)試劑，操作人員無需特殊培訓(xùn)或?qū)I(yè)化學(xué)知識。

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.

二氧化碳測量循環(huán)

儀器每4分鐘檢測得出一個數(shù)據(jù)（包括TOC值和電導(dǎo)率值），在4分鐘的測量循環(huán)中TC和TIC是獨(dú)立檢測的。

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.

在線檢測裝置

進(jìn)入儀器內(nèi)部后水樣的流速大約為0.5 ml/min。進(jìn)入在線檢測裝置的水樣溫度可以在1～95℃范圍內(nèi)，儀器的廢液和在線檢測裝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

試劑準(zhǔn)備

(1)鄰苯二甲酸氫鉀(KHC8H4O4)：基準(zhǔn)試劑

(2)無水碳酸鈉：基準(zhǔn)試劑

(3)碳酸氫鈉：基準(zhǔn)試劑

(4)無二氧化碳蒸餾水

附件：

試驗主機(jī)一臺

采集管兩條

電源線一條

控制系統(tǒng)一套

數(shù)據(jù)采集系統(tǒng)一套

產(chǎn)品使用說明書一份

產(chǎn)品合格證、保修卡一份

折疊電導(dǎo)率檢測法

　　TOC電導(dǎo)率檢測技術(shù)能夠測量液態(tài)的CO2。業(yè)界采用的主要有兩種電導(dǎo)率檢測技術(shù):一種是直接電導(dǎo)率法，另外一種是薄膜電導(dǎo)率檢測法(又稱選擇性電導(dǎo)率法)。采用兩種電導(dǎo)率法的TOC分析儀校驗結(jié)果都很穩(wěn)定，檢測精度高。這兩種技術(shù)最主要的區(qū)別在于，直接電導(dǎo)率法比較容易受雜酸性，鹵化有機(jī)物等的干擾;而薄膜電導(dǎo)率檢測技術(shù)抗干擾性更佳。

　　薄膜電導(dǎo)率檢測法是GE TOC分析儀使用較多的檢測方法，TOC分析儀使用的膜能防止雜離子的通過，確保檢測的只是CO2的含量，從而使TOC的讀數(shù)更為精確。

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