Method for quantitatively analyzing residual Cl in zinc ferrite

Patent metadata

Field	Value
Publication number	US-11249060-B2
Application number	US-201816605704-A
Country	US
Kind code	B2
Filing date	Jul 16, 2018
Priority date	Aug 18, 2017
Publication date	Feb 15, 2022
Grant date	Feb 15, 2022

Abstract

The present invention relates to a method for quantitatively analyzing Cl, remaining after synthesis, in zinc ferrite synthesized using chloride precursors such as zinc chloride and iron chloride, and provides a method capable of using, in a quantitative analysis method of Cl remaining after synthesis of an inorganic material, AQF-IC, which has been used only in the quantitative analysis of an organic sample since gaseous Cl, discharged after burning zinc ferrite in an automatic quick furnace (AQF) by using an Sn capsule and tungsten oxide (WO3), is analyzed through ion chromatography (IC).

First claim

What is claimed is:

1. A method for quantitative analysis of residual Cl in synthesized zinc ferrite, comprising:
introducing a sample of zinc ferrite synthesized from a chloride precursor into a Sn capsule to produce an Sn capsule containing the sample;
then, continuously transferring the Sn capsule containing the samples, along with tungsten oxide (WO 3 ), into an automatic quick furnace (AQF) pretreatment apparatus heated at a high temperature;
combusting the Sn capsule containing the sample in the AQF pretreatment apparatus;
collecting gaseous Cl released by the combustion in the AQF pretreatment apparatus in an absorbing solution; and
injecting the absorbing solution in which gaseous Cl has been collected into an ion chromatography (IC) device, and then quantifying a Cl content.

2. The method for quantitative analysis according to claim 1 , wherein the chloride precursor is zinc chloride or iron chloride.

3. The method for quantitative analysis according to claim 1 , wherein the sample is transferred into the AQF pretreatment apparatus for less than 10 seconds.

4. The method for quantitative analysis according to claim 1 , wherein the combustion is carried out at a temperature of 1,000° C. or higher.

5. The method for quantitative analysis according to claim 1 , wherein the absorbing solution is a solution of H 2 O: H 2 O 2 =300:1 to 350:1 (volume ratio).

6. The method for quantitative analysis according to claim 1 , wherein WO 3 is a combustion improver that causes complete combustion during the sample combustion.

7. The method for quantitative analysis according to claim 4 , wherein a maximum combustion temperature is about 2,000° C.

8. The method for quantitative analysis according to claim 5 , wherein the absorbing solution is a solution of 500 mL of H 2 O and 1.5 mL of H 2 O 2 .

Assignees

• Lg Chemical Ltd

Inventors

• Kim Sangwoo
• Yoon Hyun Kyung
• Na Sumin
• Kim Jieun
• Nho Hyun Woo

Classifications

• G01N31/12 Primary

  using combustion (G01N25/20 takes precedence) · CPC title

• G01N2001/2244

  Exhaled gas, e.g. alcohol detecting · CPC title

• G01N2001/2217

  using a liquid · CPC title

• G01N2030/067

  by reaction, e.g. derivatising the sample · CPC title

• G01N30/96 Primary

  using ion-exchange (G01N30/02, G01N30/90 take precedence) · CPC title