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A method for the determination of carbonate and bicarbonate in borate-containing brine

A bicarbonate and determination method technology, applied in the field of electrochemical analysis, can solve problems such as inaccurate titration, and achieve the effect of less steps, wide application range and high precision

Inactive Publication Date: 2020-07-14
CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the inability to accurately titrate CO in borate-containing brine 3 2- and HCO 3 - technical problems, the present invention adopts a fully automatic potentiometric titrator without adding an indicator, which overcomes the error caused by manual titration to determine the color of the end point with the naked eye, and can eliminate B by designing a unique titration workflow. 4 o 7 2- interference, a rapid and accurate titration of CO in borate-containing brines was established. 3 2- and HCO 3 - analysis method

Method used

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  • A method for the determination of carbonate and bicarbonate in borate-containing brine
  • A method for the determination of carbonate and bicarbonate in borate-containing brine
  • A method for the determination of carbonate and bicarbonate in borate-containing brine

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Experimental program
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Effect test

Embodiment 1

[0053] Embodiment 1: Accurately pipette two parts of No. 1 standard sample 10ml, place them in 100ml plastic beakers respectively, add water to dilute to 40ml, and carry out end-point titration to pH 4.4 with hydrochloric acid standard solution (1.3) for the first standard sample, and analyze total alkali degree (total alkalinity refers to the CO in the titration system 3 2- 、HCO 3 - and B 4 o 7 2- The total volume of the hydrochloric acid standard solution consumed by the reaction with hydrochloric acid, the same below), record the volume V of the hydrochloric acid standard solution (1.3) consumed 1 , followed by sodium hydroxide standard solution (1.4) to measure the borate content in the sample (perform automatic titrator analysis "analysis method of boron content in borate", the same below), record the volume of the consumed NaOH standard solution (1.4) V 3 In the second standard sample, use the liquid feeding function of the automatic potentiometric titrator (the f...

Embodiment 2

[0054] Embodiment 2: Accurately pipette two parts of No. 2 standard sample 10ml, place them in 100ml plastic beakers respectively, add water and dilute to 40ml, carry out endpoint titration to pH 4.4 with hydrochloric acid standard solution (1.3) for the first part of standard sample, and analyze total alkali degree, record the volume V of the consumed hydrochloric acid standard solution (1.3) 1 , followed by NaOH standard solution (1.4) to measure borate content in the sample (perform automatic titrator analysis "analysis method of boron content in borate"), record the volume V of NaOH standard solution (1.4) consumed 3 In the second standard sample, utilize the liquid feeding of the automatic potentiometric titrator (the feeding liquid points to the titration system to add a certain solution in advance, and the volume is accurate to 0.01ml) function to quantitatively feed NaOH standard solution (1.4) 10ml into the titration system , add 3g of mannitol, stir well, carry out e...

Embodiment 3

[0055] Embodiment 3: Accurately pipette two parts of No. 3 standard sample 10ml, place them in 100ml plastic beakers respectively, add water and dilute to 40ml, carry out endpoint titration to pH 4.4 with hydrochloric acid standard solution (1.3) for the first part of standard sample, and analyze total alkali degree, record the volume V of the consumed hydrochloric acid standard solution (1.3) 1 , followed by NaOH standard solution (1.4) to measure borate content in the sample (perform automatic titrator analysis "analysis method of boron content in borate"), record the volume V of NaOH standard solution (1.4) consumed 3 ; In the second standard sample, utilize the feed liquid of the automatic potentiometric titrator (the feed liquid points to the titration system to add a certain solution in advance, and the volume is accurate to 0.01ml) function to quantitatively feed NaOH standard solution (1.4) 20ml into the titration system , add 3.5g mannitol, stir well, carry out end-po...

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Abstract

A method for detecting carbonate ions and bicarbonate ions in borate-containing brine comprises the following steps: accurately taking two parallel samples, respectively placing the two samples in containers, diluting every sample with ultrapure water which is free from carbon dioxide through boiling to 35-45 ml, performing endpoint titration on the obtained first titration system by using a hydrochloric acid standard solution until the pH value is 4.4, analyzing the total alkalinity, recording the volume V1 of the consumed hydrochloric acid standard solution, determining the content of borates in the sample, and recording the volume V3 of a NaOH standard solution; quantitatively feeding V4 of the NaOH standard solution to the above obtained second titration system, adding mannitol, performing uniform stirring, performing endpoint titration by using the hydrochloric acid standard solution until the pH value is 8.4, and recording the volume V2 of the consumed hydrochloric acid standardsolution; and calculating the concentrations of CO<3><2-> and HCO<3><->. The method can eliminate the interference of B4O<7><2->, and allows the CO<3><2-> and HCO<3><-> in the borate-containing brineto be rapidly and accurately titrated.

Description

technical field [0001] The invention belongs to the field of electrochemical analysis, in particular to a method for CO in borate-containing brine 3 2- and HCO 3 - method of measurement. Background technique [0002] Salt lake brine is classified according to chemical composition, and can be divided into chloride salt type, sulfate type and carbonate type. Its common coexisting ions are Na + 、K + , Li + , Mg 2+ , Ca 2+ , CO 3 2- 、HCO 3 - , B 4 o 7 2- , Cl - . Borates in brine are mainly B 4 o 7 2- form exists, B 4 o 7 2- It is highly alkaline when hydrolyzed in aqueous solution. [0003] [0004] h 3 BO 3 K a =5.8×10 -10 , very small, but its conjugate base H 2 BO 3 - Significantly strong alkaline, K b =1.74×10 -5 , can be accurately titrated by strong acid. [0005] CO in brine 3 2- and HCO 3 - The determination method generally adopts the double indicator method and directly titrates with hydrochloric acid, but this is limited to th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 杨三妹刘雨星邹娟罗稳杨清梁晓玲汤建良谭之海
Owner CHANGSHA DESIGN & RES INST OF CHEM IND MIN