目前实验室测定含油污泥中水含量的方法有烘干法、卡尔·费休法、低场核磁共

At present, the methods for determining the water content of oily sludge in the laboratory include drying method, Karl Fischer method, low-field nuclear magnetic resonance <br>method, azeotropic distillation method, cable extraction method, etc. <br>(1) Drying method: The sludge is dried in an oven at 105 ° C, and the mass of the sludge before and after drying is weighed out respectively. <br>The water in it is vaporized by heating, and the water content in the sludge is calculated by the subtraction method. This method is simple and convenient to operate, but <br>the oil in the sludge is also easy to volatilize during the operation. Therefore, this method is not suitable for the determination of sludge with high water content. <br>(2) Low-field nuclear magnetic resonance method: oil and water in sludge have different viscosities and contain a <br>large amount of protons in oil and water . Low-field nuclear magnetic resonance method (LF-NMR) mainly measures the response derived from hydrogen protons signal from <br>the moisture content of the sludge may be drawn in. When the magnetic field is applied, the direction of the magnetic field generated by the hydrogen proton spin is the <br>same as or opposite to the direction of the applied magnetic field . And the hydrogen proton only comes from the oil and water in the sludge. Therefore, the <br>water content of the sludge can be measured by measuring the response signal of the hydrogen proton . <br>(3) Karl Fischer method: This is a trace of water commonly used method for determining, using the Karl Fischer apparatus dropwise <br>set, water is added until the reaction was complete. According to Faraday's law, the amount of electricity was in direct proportion to the iodine produced off <br>line. The chemical reaction of the reaction is as follows:

At present, laboratory methods to determine water content in oily sludge are drying method, Carl Feishu method, low field MRI<br>law, co-boiling distillation method, rope extraction, etc.<br>(1) Drying method: the sludge is placed in the oven at 105 degrees C to dry, respectively, the quality of the sludge before and after drying,<br>The water is steamed by heat, and the water content in the sludge is calculated by differential and subtraction. This method is simple and easy to operate, but<br>The oil in the sludge is also prone to volatilization during operation, so the method is not suitable for determining the high water content of the sludge.<br>(2) Low-field NUCLEAR magnetic resonance method: oil and water in the sludge have different viscosity, and in the oil and water both contain<br>A large number of protons, the low-field nuclear magnetic resonance method (LF-NMR) is mainly measured by measuring the response signal from the hydrogen proton, from the<br>The moisture content in the sludge can be obtained. When a magnetic field is applied, the direction of the magnetic field produced by the spin of the hydrogen proton and the direction of the applied magnetic field<br>same or vice versa. And hydrogen protons come only from oil and water in the sludge, so the hydrogen proton's response signal can be measured.<br>The water content of the sludge was measured.<br>(3) Carl Fahey: This is a common method for determining trace water, using the Carl Fasufa device for drip<br>until the added water is reflected. According to Faraday's electrolytic law, the electricity consumed is positively proportional to the iodine produced<br>System. The reaction is as follows:

At present, the laboratory methods for determining the water content of oily sludge include drying method, Karl Fischer method and low field NMR<br>Method, azeotropic distillation, rope extraction, etc.<br>(1) Drying method: dry the sludge in an oven at 105 ℃, and weigh the quality of the sludge before and after drying,<br>The water in the sludge is vaporized by heating, and the water content in the sludge is calculated by the difference method. This method is simple and convenient to operate, but<br>The oil in the sludge is also easy to volatilize during operation, so this method is not suitable for the determination of sludge with high water content.<br>(2) Low field NMR method: oil and water in oil sludge have different viscosity, and both of them contain<br>A large number of protons, low field nuclear magnetic resonance (LF-NMR) mainly by measuring the response signal from hydrogen protons, from<br>The water content in the sludge can be obtained. When the magnetic field is applied, the direction of the magnetic field produced by the spin of the hydrogen proton and the direction of the applied magnetic field<br>Same or opposite. And the hydrogen protons only come from the oil and water in the sludge. Therefore, the response signal of hydrogen protons can be measured<br>Measure the water content of sludge.<br>(3) Karl Fischer method: This is a common method for the determination of trace water. Use the Karl Fischer method device to drop<br>Until the added water is reacted. According to Faraday's law of electrolysis, the consumption of electricity is positively proportional to the production of iodine<br>Department. The chemical reactions are as follows: