润滑油中酸值检测方案

No.TIA-06312ApplicationNoteNon-aqueoustitration Petroleumproducts Acid number of lubricant 1. Abstract The Acid number of petroleum products and lubricants can be determined by thepotentiometric titration method with 0.1mol/L Potassium hydroxide·2-propanolsolution according to “JISK2501 Petroleumproducts and lubricants-determination of neutralization number”，“ASTM D664 Standard Test Method forAcid Number of Petroleum Products by Potentiometric Titration” and“ISO 6619Petroleumproductsand lubricants-Neutralization number- Potentiometrictitration method” and the like. The endpoint is the inflection point in the titrationcurve. The Acid number of petroleum products and lubricants is calculated from thevolume titrated of Potassium hydroxide·2-propanol solution. The samplesshould be previously dissolved in the mixture of solvents -usually comprised ofToluene， 2-propanol anda small amount of distilled water. The acidiccomponents of petroleum products and lubricants which are dissolved in thismixed solvent are： Organic acids， Inorganic acids， Ester， Phenol compounds，Lactone， Resin， Heavy metal salts， Ammonium salts or other weak acidiccompounds and Polybasic acid salts and the like. 2.Reference 1) JIS K2501 Petroleum products and lubricants - determination of neutralizationnumber 2) ASTM D664 Standard Test Method for Acid Number of Petroleum Products byPotentiometric Titration 3) ISO 6619Petroleum productsanddlubricantsS-Neutralization number-Potentiometric titration method 3.Tips for measurement 1) Immerse the electrode in distilled water for ca a few minutes to one hour aftereach measurement in order to restore the sensitivity of the electrode(Depolarization). 2) Standardize Potassium hydroxide·2-propanol solution frequently enough todetect concentration changes of 0.0005mol/L or less. TIA-06312 1/4 4.Equipment Main unit ： Automatic potentiometric titrator AT-510 Detector ： Standard preamplifier STD-510 Combination glass electrode C-172+ Cable #429-0012 5. Reagent Titration solution ： 0.1mol/L Potassium hydroxide-2-propanol solution Solvent ： mixture of 500mL of Toluene， 5mL of water， and 495mL of2-propanol. 6. Analysis Procedure 1) Place ca. 0.2g of sample in 200mL beaker. 2) Add 100mL of solvent. 3) Titrate with 0.1mol/L Potassium hydroxide-2-propanol solution to determine thetotal acid number of lubricant. 7. Calculation Total acid number(mg/g)：(EP1-BL1)xTFxC1xK1/SIZE EP11 ：volume(mL) BL1 ： blank (mL)=0 ： titrant factor=0.9999 C： concentration conversion coefficient=5.611(1mL of 0.1mol/L KOH·(CH3)2CHOH corresponds to 5.611mg of KOH) K1 ： unit conversion coefficient=1 SIZE ： sample size (g) 8. Example of Measurement -Ambient condition一 Date：2006/07/13 15：44Sample ID ： Method No.： 11 Method Name： Acid Value Dose Reagent Name：0.1M/L-KOH Titr Reagent Name：0.1M/L-KOH Method Type ： Dose&Titr. Mode ： Volume StopAPB No. ：1Unit No. ：1Volume ：3.0mLCut-Off Time ： 0 sDispense Speed ：1 s/mLDose Wait ： 0 S Form ： EP STOP APB No. ：1 Unit No. ：1Detector No.：：1Unit ：mVMax Volume ：10 mLWait Time ：30 sDirection ：Auto Titr. Form ：EP STOP *** Result *** Sample No. 12-02 Date：2006/07/13 15：44Sample ID ： Method No. ：11 Method Name： Acid Value Titr. Time ：00：10：16 Size ： 0.1176g Conc-1 112.35mg/g End Point-1 Volume ：4.3576mLPotential ：-311.1mV 一500 CmV3 10610.000 T 8.000 [mL.] End Point No.：：1 End Sense ：Auto End Point Area ：Off Separation ： Off Over Titr.Vol. ：0.0mLCut-off Time ：15sUnit Volume ：0.05mL Dispense Speed： 1 s/mLGain ：1 Data Samp.Pot. ： 4.0 mVData Samp.Vol. ：0.05mL Calc. Type ：SampleConc.1 ： Set CO1=(EP1-BL1)*TF*C1*K1/SIZE Unit ：mg/gEP No. ：1Conc.2 ： OffConc.3 ： OffConc.4 ：OffConc.5 ：Off Temp. Comp ： Off C1(mg/mL) ：5.611 Factor ：0.9999Conc. ：0.100 Factor ：0.9999Conc. ：0.100 Blank 1 ：0.0 Http：//www.shxf17. com -Results- Run Size(g) Vol.(mL) Total acid number(mg/g) 12 3 0.21760.19360.2086 4.35763.84184.1693 112.35111.33 112.14 Statistics MeanSD RSD 111.94 mg/g0.5371 mg/g0.4798% 【AT-610】【AT-510】 【AT-500N-1】 Awarded Supreme Technology fromKyoto City ·Compact and cost performancemodel ·Low cost and high performance · Easy view with back light LCD ●·Easy key entry by touch panel oflarge color LCD (8-inch wide) · PC card expands data memory forconvenience and versatility. r· GLP/GMP conformed model ·Simultaneous titration in parallel · Both potentiometric and KarlFischer moisture titration(coulometric·volumetric)can beperformed at a time. K-M KYOTO ELECTRONICS MANUFACTURING CO.，LTD. Overseas Division： 8-3，Niban-cho，Chiyoda-ku，TOKYO 102-0084 JAPAN FAX： +81-3-3237-0537， Phone：+81-3-3239-7333 E-mail： export@kem.co.jp URL：http：//www.kyoto-kem.com Factory： 56-2 Ninodan-cho，Shinden Kisshoin，Minami-ku，KYOTO601-8317，JAPAN FAX： +81-75-691-9961， Phone： +81-75-691-4122 E-mail： tech-english@kem.co.jp 200072 Http：//www.shxf17. com 上海旭风科学仪器有限公司 上海市闸北区荣路 Http：//www.shxf comTel： Fax： 周峰 zhou-fengcom TIA Fax： 周峰 zhou-fengcom