Method for determining content of triethylamine salt

[0041] Accurately weigh 1.0086 g of a sample containing triethylamine hydrochloride, place it in a separatory funnel filled with 20 mL of water, shake well, add 1 drop of 1 g / L methyl red indicator solution, dropwise add 100 g / L Sodium hydroxide solution, shake while adding, until the solution turns yellow, add 2mL in excess; add 20mL of chloroform accurately, shake for 1 minute (about 140~160 times of shaking), and pay attention to degassing; wait for standing to separate Finally, dry the trace moisture on the neck of the funnel with clean absorbent cotton, then slowly open the funnel plunger, discard the first 3 mL of the chloroform extract, and then collect the remaining extract in a dry and clean container; accurately absorb and collect Put 10mL of the extract solution in a conical flask filled with 30mL ethanol solution (80+20), add 1 drop of 1g / L methyl red indicator solution, and titrate with 0.1003mol / L hydrochloric acid standard titration solution until the soluti

[0053] Example 2 (Verification of accuracy: comparison with national standard method results)

[0054] Accurately weigh 2.5128g of triethylamine reagent (99.1% determined according to relevant national standards), add it into a 100mL volumetric flask filled with about 60mL of water, add water to dilute to the mark, and shake well to make a triethylamine standard solution. Accurately draw 10 mL of the solution and put it in a separatory funnel, add 5 mL of hydrochloric acid solution (1+3), shake well to make it completely form triethylamine hydrochloride, add 1 drop of 1 g / L methyl red indicator solution, and follow the Embodiment 1 continues to measure since "dropping the sodium hydroxide solution of 100g / L". Consume 12.30 milliliters of hydrochloric acid standard titration solution of 0.1003mol / L when titration finishes, calculate result, record triethylamine and be 0.2497g.

[0055] And the triethylamine reagent 2.5128g that measured content is 99.1% according to nationa

[0065] Example 8 (precision experiment)

[0066] Select same sample for use, after weighing six parts respectively, according to the step described in embodiment 1, carry out triethylamine hydrochloride content determination and calculation, record the average content of triethylamine hydrochloride in this sample as 31.38%, RSD=0.59%, the specific data is shown in Table 2 below.

[0067]

[0068] Table 2

[0069]