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| A new automatic titrator
[L2 average CV / 3 port. 3830.348O363O86OO664000243024.332 {. 2824.30Ol030.0018.20l8.27lS. 26l8.2402120.00l220l2.24l2281222O17l0006.1876l826178/618200735.0031473l338.1468】 42O252.00l2681275l260】 276l270O. Correlation coefficient r0.9999953030999997l6809999970800.9999977l81996 58 No. 2 5l2 linearity of the instruments: the volume of titrant volume of the sample linear regression correlation coefficient r> 0.9999 (N a 7) Test Methods: The sample C (I / 2HSO.) a 0.1moi / L sodium hydroxide solution, 3 times repeated. The results in Table 2. If the volume size of the cross above the titrant solution volume of the sample regression, correlation coefficient of 0.999997425 [(NaOH) a 30.28,24.28,18.27,12.20.6.187.3.133,1. 276 mL] and 0.999993978 [V (NaOH) a 3O. 34,24.33,18.20,ghd deutschland,12.24,6.178,3.147,1.260 mL ~ N-7 shows the regression, r must be greater than 0.9999. 3. Rate r index: 99.7 ~ 100.3 Test method: (1) determine the blank: This study has two blank sources: reagents and the lagged effects of the electrode. Simple determination of free samples only solution the volume of titrant consumed solid as a blank value in Table 3 does not apply to very small. Titrant volume should be the linear regression on the sample size. Extrapolated to zero when the sample volume of titrant (ie, the working curve intercept on the vertical axis) obtained blank. Titrant consumed in this experiment, the average size of the sample (volume) of the regression curve of the longitudinal axis of the work (volume of titrant consumed) intercept is equal to 0.101lmL,ghd stijltang, is the blank value. Experiments show that the volume of sample solution 5mL and 10mL, the 2-point working curve of the longitudinal axis regression intercept and regression results similar to 7, are listed in Table 2, the amount of 5mL and 10mL sample volume of titrant consumed for the entire group can Taiwan regression (9 groups) data, the intercept at 0.079 ~ 0.116mL, average 0.1079mL. The experiment to determine the blank value 0.10mL. (2), titrant calibration: instrument warm-up, enter a blank value 0.10mL, since instruments are deducted the value of work. Weigh about 0.5g ( standard to 0.0001g) of potassium hydrogen phthalate standard substance 4,GHD glätteisen günstig, titration instruments. Titration results according to formula (1) calculation of the sodium hydroxide concentration in Table 3. c (Na (] H) one (1) No. 2 reference material quality of thirty (KHP) / gO.52640.53620.466OO4433 titrant volume V (NaOH) / mol ・ f_. 26122670831926.05 titration Jing heap degrees C (NaOH) / mol ・ LO.O98690.09871O09653009845 concentration average C (NaOH) / tool ・ L ) 86O coefficient of variation CV / (3) the determination of recovery: re-called standard potassium hydrogen phthalate-based material 4, with concentration of titrant has been calibrated titration. Titration results and by the formula m (KHP) a 0.2042C ( NaOH) V (NaOH) base material quality and calculated by the formula rate rm. (KHP) / m (KHP) calculate the recovery rate are listed in Table 4. Table 4 No. 2 basis of substance m (KHP) / gO. 54480.46760.464lO. 5l02 entropy doses volume V (NaOH) / mI27.0463.22830725.27 side of the base material was the quality of m (KHP) / g0.5444O4675046 {50.5088 recycling base r/989399.98l00, 0989.73 The average recovery r,ugg boots ireland, 99.93 variant London CV/0l54. Determination of the stability of the pH indicators: 30min Determination of drift is not more than 0.01pH: Instrument warm-30rain, the use of pH4.00,uggs ireland, 9.18 two standard calibration buffer solution to determine the pH6. 86 More articles related to topics： ugg boots sale Sensitive dual-flame photometric de ghd haarglätter Northern South China Sea continent ghd haarglätter Fulda widely praised by experts, _ |
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