JPS61226658A - Anion analyzing method - Google Patents

Anion analyzing method

Info

Publication number
JPS61226658A
JPS61226658A JP6741185A JP6741185A JPS61226658A JP S61226658 A JPS61226658 A JP S61226658A JP 6741185 A JP6741185 A JP 6741185A JP 6741185 A JP6741185 A JP 6741185A JP S61226658 A JPS61226658 A JP S61226658A
Authority
JP
Japan
Prior art keywords
acid
anion
arom
ion
anions
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP6741185A
Other languages
Japanese (ja)
Other versions
JPH0715467B2 (en
Inventor
Hirohisa Mikami
三上 博久
Masayuki Nishimura
雅之 西村
Yoshiyuki Watabe
悦幸 渡部
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shimadzu Corp
Original Assignee
Shimadzu Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shimadzu Corp filed Critical Shimadzu Corp
Priority to JP60067411A priority Critical patent/JPH0715467B2/en
Publication of JPS61226658A publication Critical patent/JPS61226658A/en
Publication of JPH0715467B2 publication Critical patent/JPH0715467B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PURPOSE:To decrease noise and drift without entailing a decrease in sensitivity and an increase in holding time by using an arom. base acid having high anion eluting power as a UV absorbent eluting agent in place of a phthalic acid. CONSTITUTION:The arom. tribasic acid as the UV absorbent eluting agent is added into a polar mobile phase and the sepn. of anions is executed. The anions are detected from the UV absorbancy of the separated effluent by the arom. Tribasic acid. More specifically, the arom. tribasic acid is used in place of the conventional UV absorbent eluting ion in reversed-phase chromatography. The arom. tribasic acid is exemplified by benzene tricarboxylic acids such as trimesic acid, trimellitic acid and hemellitic acid. The time for analysis is thereby improved as compared to conventional practice and since the background can be decreased, the improvement of the noise, drift, sensitivity and linearity is possible.

Description

【発明の詳細な説明】 (イ)産業上の利用分野 この発明は、液体クロマトグラフィによる陰イオン分析
法に関する。さらに詳しくは逆相イオンペアクロマ上グ
ラフィによる陰イオン分析の改良に関する。
DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to an anion analysis method using liquid chromatography. More specifically, the present invention relates to improvements in anion analysis using reversed-phase ion pair chromatography.

(0)従来技術 液体クロマトグラフィによる陰イオンの分析法としては
いわゆるイオンクロマトグラフィ法が知られているが、
装置が専用化してしまい汎用性に乏しくかつ高価である
。この点に鑑み、イオン交換クロマトグラフィにおいて
、移動相中に紫外吸収性イオンを添加して陰イオンの分
離を行ない、対象陰イオンの溶出の際にこの紫外吸収性
イオンが減少して溶出液の紫外吸光光度が低下する現象
を利用して各種陰イオンの分離分析を行なう提案がなさ
れている(特開昭57−20662号公報)。この方法
は分析対象の陰イオンと上記光吸収性イオン(陰イオン
)との和が系中の対イオン(陽イオン)に対応して一定
となる電気的中性の原理に基づくものであり、光吸収性
イオンは陰イオンの溶離用として働きかつ間接的な陰イ
オンの検出用として働く。そして液体クロマトグラフィ
で一般の用いられる紫外吸光光度計を用いるため汎用性
は高い方法といえる。
(0) Prior art The so-called ion chromatography method is known as an anion analysis method using liquid chromatography.
Since the device is specialized, it lacks versatility and is expensive. In view of this, in ion-exchange chromatography, anions are separated by adding ultraviolet-absorbing ions to the mobile phase, and when the target anion is eluted, these ultraviolet-absorbing ions decrease, causing A proposal has been made to separate and analyze various anions by utilizing the phenomenon of decrease in absorbance (Japanese Patent Laid-Open No. 57-20662). This method is based on the principle of electrical neutrality, in which the sum of the anion to be analyzed and the light-absorbing ion (anion) is constant depending on the counter ion (cation) in the system. The light-absorbing ions serve for anion elution and indirect anion detection. Since it uses an ultraviolet absorption photometer commonly used in liquid chromatography, it can be said to be a highly versatile method.

かかる紫外吸収性溶離イオンを用いた手法を、いわゆる
逆相イオンペアクロマトグラフィに応用する提案もなさ
れている(M、C00ke、  “Jour−nal 
 of  Hiah  Resolution  Ch
romatoar−aphy  &  Chromat
ography  Co+nunications ”
Vo17.第515〜519頁(1984) )。ここ
で逆相イオンペアクロマドグラフィとは、極性移動相と
非極性固定相とを組み合せ、分析対象のイオンとイオン
ペアを形成しうるカウンターイオンの存在下で分離分析
を行なう方法であり、一般にイオン交換クロマトグラフ
ィよりも高カラム効率が得られ、またイオン交換クロマ
トグラフィでの成分の保持は充填剤のイオン交換容口に
より決定されるのに対し、この逆相イオンペアクロマト
グラフィでは極性移動相に添加するカウンターイオン(
例えば、テトラブチルアンモニウムイオン)の濃度によ
り保持を調節するという利点を備えた方法である。そし
て上記M 、Cookeの文献によれば、カウンターイ
オンとしてテトラブチルアンモニウムを用い、紫外吸収
性溶離イオンとしてフタル酸を用いることにより各種陰
イオンの紫外吸収による分離分析が可能であるとされて
いる。
It has also been proposed to apply such a method using ultraviolet-absorbing eluent ions to so-called reversed-phase ion pair chromatography (M, C00ke, “Jour-nal
of Hiah Resolution Ch.
romatoar-aphy & Chromat
ogrphy Co+nunciations”
Vo17. No. 515-519 (1984)). Reversed-phase ion pair chromatography is a method in which a polar mobile phase and a non-polar stationary phase are combined to perform separation analysis in the presence of a counter ion that can form an ion pair with the ion to be analyzed. Column efficiency is higher than in chromatography, and whereas in ion-exchange chromatography the retention of components is determined by the ion-exchange capacity of the packing material, reversed-phase ion-pair chromatography requires only a counter ion (added to the polar mobile phase).
For example, this method has the advantage of controlling retention by adjusting the concentration of tetrabutylammonium ion. According to the above-mentioned literature by M. Cooke, separation and analysis of various anions by ultraviolet absorption is possible by using tetrabutylammonium as a counter ion and phthalic acid as an ultraviolet absorbing eluent ion.

しかしながら、上記逆相イオンペアクロマグラフィーに
おいては、移動相中に添加される紫外吸収性溶離イオン
、すなわちフタル酸の濃度があまり高いと吸光度測定セ
ルを通過する光量自体が小さくなり、その結果バックグ
ラウンドが高くなってノイズやドリフトの原因となり、
また直線性も悪化するという問題点が生じる。そのため
フタル酸添加量をできるだけ減少させることが考えられ
るが、この場合には保持時間が長くなって感度が低ドし
、ことに硫酸イオンなどの保持の強い陰イオンを含む試
料を対象とした際に分析時間が著しく長くなるという不
都合が生じる。また、移動相のpHを上げることにより
硫酸イオンなどの溶出をはやめることも考えられるが、
溶出のはやいイオンの分離を損わずに行うには限界があ
る。さらにまた、DHを上げることは液体クロマトグラ
フィで広く用いられるシリカ担体の逆相クロマトグラフ
ィ用充てん剤の劣化をはやめることにもなり好ましくな
い。
However, in the above-mentioned reversed-phase ion pair chromatography, if the concentration of the ultraviolet absorbing eluent ion added to the mobile phase, that is, phthalic acid, is too high, the amount of light passing through the absorbance measurement cell itself becomes small, and as a result, the background is reduced. becomes high and causes noise and drift,
Further, there arises a problem that linearity also deteriorates. Therefore, it is possible to reduce the amount of phthalate added as much as possible, but in this case, the retention time becomes longer and the sensitivity decreases, especially when dealing with samples containing strongly retained anions such as sulfate ions. The disadvantage is that the analysis time becomes significantly longer. It is also possible to stop the elution of sulfate ions, etc. by increasing the pH of the mobile phase.
There is a limit to how quickly eluting ions can be separated without loss. Furthermore, increasing the DH is also undesirable because it will stop the deterioration of the silica carrier packing material for reverse phase chromatography, which is widely used in liquid chromatography.

(ハ)発明の目的 この発明は、上記従来の問題点を解消すべくなされたも
のであり、感度の低下や保持時間の増加を招くことなく
、ノイズやドリフトを改善できる紫外吸収による逆相イ
オンペアクロマトグラフィを提供しようとするものであ
る。
(c) Purpose of the Invention The present invention was made to solve the above-mentioned conventional problems, and provides a reversed-phase ion pair using ultraviolet absorption that can improve noise and drift without reducing sensitivity or increasing retention time. The aim is to provide chromatography.

本発明者らは、各種分析条件について鋭意研究を行なっ
た結果、紫外吸収性溶離イオンとしてフタル酸の代わり
にトリメシン酸等の芳香族三塩基酸を用いることにより
、フタル酸より低い添加層で、かつ、pHを上げること
なく弱酸性領域で陰イオンの保持時間を短縮でき、陰イ
オンの保持時間を短縮でき、溶出のはやいイオンの分離
を損わずに1iAI!!イオン等の保持の強い陰イオン
の溶出時間を著しく短縮化でき、またフタル酸よりも低
い添加mでも従来と同程度の分析時間や感度が得られる
ためセル通過光量を分析時間や感度に悪影響を与えるこ
となく増加させることができバックグラウンドを低減さ
せることができる事実を見出した。
As a result of intensive research on various analysis conditions, the present inventors found that by using an aromatic tribasic acid such as trimesic acid instead of phthalic acid as an ultraviolet-absorbing eluent ion, the present inventors can achieve In addition, the retention time of anions can be shortened in a weakly acidic region without increasing the pH, and the retention time of anions can be shortened without impairing the separation of quickly eluting ions. ! The elution time of strongly retained anions such as ions can be significantly shortened, and analysis time and sensitivity comparable to conventional methods can be obtained even with a lower additive molar ratio than phthalic acid. We have discovered the fact that the background can be reduced without increasing the background.

(ニ)発明の構成 かくしてこの発明によれば、極性移動相と非極性固定相
とを用い分析対象の陰イオンとイオンペアを形成しつる
カウンターイオンの存在下で陰イオンの分離分析を行な
う逆相イオンペアクロマトグラフィにおいて、 上記極性移動相中に紫外吸光性溶離剤としての芳香族三
塩基酸を添加して陰イオンの分離を行ない、分離流出液
の芳香族三塩基酸による紫外吸光光度に基づいて陰イオ
ンを検出することを特徴とする陰イオン分析法が提供さ
れる。
(d) Structure of the invention Thus, according to the present invention, a reversed phase method for performing separation analysis of anions in the presence of a counter ion that forms an ion pair with an anion to be analyzed using a polar mobile phase and a non-polar stationary phase. In ion pair chromatography, an aromatic tribasic acid as an ultraviolet-absorbing eluent is added to the polar mobile phase to separate anions, and anions are detected based on the ultraviolet absorbance of the aromatic tribasic acid in the separated effluent. An anion analysis method is provided that is characterized by detecting ions.

この発明は、逆相イオンペアクロマトグラフィにおける
従来の紫外吸収性溶離イオンの代わりに芳香族三塩基酸
を用いたものである。これにより従来に比して分析時間
を改善することができ、またバックグラウンドを低下さ
せることができるため、ノイズ、ドリフト、感度及び直
線性を改善することが可能である。
This invention uses an aromatic tribasic acid in place of the conventional ultraviolet absorbing eluent ion in reversed phase ion pair chromatography. As a result, analysis time can be improved compared to the conventional method, and background can be reduced, so that noise, drift, sensitivity, and linearity can be improved.

上記芳香族三塩基酸としては、トリメシン酸、トリメリ
ット酸、ヘミメリット酸等のベンゼントリカルボン酸が
挙げられる。かかる芳香族三塩基酸はもちろん塩の形態
で添加されてもよい。この添加量は条件によっても異な
るが、紫外光の検出器の感度やバックグラウンドの点で
、0.1〜1.51M(移動相中)とするのが適してい
る。
Examples of the aromatic tribasic acids include benzenetricarboxylic acids such as trimesic acid, trimellitic acid, and hemimellitic acid. Such an aromatic tribasic acid may of course be added in the form of a salt. Although the amount added varies depending on the conditions, it is suitable to be 0.1 to 1.51 M (in the mobile phase) from the viewpoint of the sensitivity of the ultraviolet light detector and the background.

なお、他の条件は公知の逆相イオンペアクロマトグラフ
ィで知られた条件を適宜選択すればよい。
Note that other conditions may be appropriately selected from those known in known reversed-phase ion pair chromatography.

その代表例としては、いわゆるODS系の非極性固定相
を用い、カウンターイオンとしてのテトラブチルアンモ
ニウムイオンを含む−4〜7の移動相を基本的に用いて
溶離を行なう方法が挙げられる。
A typical example thereof is a method in which a so-called ODS-based nonpolar stationary phase is used and elution is performed basically using a mobile phase of -4 to 7 containing tetrabutylammonium ion as a counter ion.

(ホ)実施例 各種陰イオン成分を含む試料(水溶液)についてこの発
明の方法により分離分析を行なった。用いた試料中の陰
イオン成分は下表の通りである。
(e) Example Separation and analysis of samples (aqueous solutions) containing various anionic components were carried out by the method of the present invention. The anion components in the samples used are shown in the table below.

(以下余白、次頁に続く。) 表1 なお、分析条件は以下の通りである。(Margin below, continued on next page.) Table 1 The analysis conditions are as follows.

分析カラム: S hill −1)aCkCLC−O
DSカラム (島津製作所社製;内径6.0nua長さ153)移動
相:O,43eMトリメシン酸(紫外吸光性溶離剤)、
1.0a+ M水酸化テトラブチルアンモニウム、(カ
ウンターイオン)を含むpH4,6水溶液(KOHで一
調整) 流 速:  1.5w11分 カラム濃度:40℃ 検出:紫外282nl (感度0.08AUFS)試料
注入量:20A 得られた結果を第1図に示す。なお、図中の番号は前記
衣1のNo、に対応する。、このように各陰イオン成分
が保持時間約10分で効率良(分離分析されていること
が判る。
Analytical column: Shill-1) aCkCLC-O
DS column (manufactured by Shimadzu Corporation; inner diameter 6.0 nua, length 153) Mobile phase: O, 43 eM trimesic acid (ultraviolet absorbing eluent),
pH 4.6 aqueous solution containing 1.0a+ M tetrabutylammonium hydroxide (counter ion) (adjusted with KOH) Flow rate: 1.5w11 min Column concentration: 40°C Detection: Ultraviolet 282nl (sensitivity 0.08AUFS) Sample injection Amount: 20A The results obtained are shown in FIG. Note that the numbers in the figure correspond to the numbers of the garment 1. In this way, it can be seen that each anion component is efficiently (separated and analyzed) with a retention time of about 10 minutes.

これに対し、トリメシン酸の代わりに7タル酸を用いて
上記と同条件下で分析を行なった場合には、硫酸イオン
の溶出に30分以上かかることとなり、分析時間を短縮
し感度を高めるためには、フタル酸の濃度を増加させる
必要があることが判るが、この場合にはバックグラウン
ドを上昇させることとなるため好ましくない。
On the other hand, if the analysis was performed under the same conditions as above using 7-talic acid instead of trimesic acid, it would take more than 30 minutes for the sulfate ion to elute. It can be seen that it is necessary to increase the concentration of phthalic acid, but this is not preferable because it increases the background.

(へ)発明の効果 この発明の陰イオン分析法によれば、フタル酸の代わり
に陰イオン溶出力の高い芳香族塩基酸を紫外吸光性溶離
剤として用いるため、少ない添加量で各種陰イオンの分
離を効率良く行なうことができる。そのため、従来に比
してバックグラウンドを減少させることができ、ノイズ
やドリフトを低減でき、濃度−感度の直線性も改善する
ことができる。
(f) Effects of the invention According to the anion analysis method of this invention, an aromatic basic acid with a high anion elution power is used as an ultraviolet absorbing eluent instead of phthalic acid, so various anions can be detected with a small amount of addition. Separation can be performed efficiently. Therefore, background can be reduced, noise and drift can be reduced, and concentration-sensitivity linearity can also be improved compared to the conventional method.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図はこの発明の陰イオン分析法により得られる分析
結果を例示するクロマトグラム図である。 第1図
FIG. 1 is a chromatogram diagram illustrating the analysis results obtained by the anion analysis method of the present invention. Figure 1

Claims (1)

【特許請求の範囲】[Claims] 1、極性移動相と非極性固定相とを用い分析対象の陰イ
オンとイオンペアを形成しうるカウンターイオンの存在
下で陰イオンの分離分析を行なう逆相イオンペアクロマ
トグラフィにおいて、上記極性移動相中に紫外吸光性溶
離剤としての芳香族三塩基酸を添加して陰イオンの分離
を行ない、分離流出液の芳香族三塩基酸による紫外吸光
光度に基づいて陰イオンを検出することを特徴とする陰
イオン分析法。
1. In reversed-phase ion pair chromatography, which uses a polar mobile phase and a non-polar stationary phase to separate and analyze anions in the presence of a counter ion that can form an ion pair with the anion to be analyzed, ultraviolet light is added to the polar mobile phase. An anion characterized in that an anion is separated by adding an aromatic tribasic acid as a light-absorbing eluent, and the anion is detected based on the ultraviolet absorbance of the separated effluent by the aromatic tribasic acid. Analysis method.
JP60067411A 1985-03-30 1985-03-30 Anion analysis method Expired - Fee Related JPH0715467B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60067411A JPH0715467B2 (en) 1985-03-30 1985-03-30 Anion analysis method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60067411A JPH0715467B2 (en) 1985-03-30 1985-03-30 Anion analysis method

Publications (2)

Publication Number Publication Date
JPS61226658A true JPS61226658A (en) 1986-10-08
JPH0715467B2 JPH0715467B2 (en) 1995-02-22

Family

ID=13344145

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60067411A Expired - Fee Related JPH0715467B2 (en) 1985-03-30 1985-03-30 Anion analysis method

Country Status (1)

Country Link
JP (1) JPH0715467B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011512535A (en) * 2008-02-15 2011-04-21 シグマ−アルドリッチ・カンパニー Imidazolium-based dicationic liquid salt and method of use thereof
JP2011512536A (en) * 2008-02-15 2011-04-21 シグマ−アルドリッチ・カンパニー Dication liquid salt and method of use thereof
JP2020060534A (en) * 2018-10-12 2020-04-16 国立大学法人福井大学 Anion detection method and kit therefor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5720662A (en) * 1980-05-27 1982-02-03 Dow Chemical Co Ion exchange chromatography with indirect spectroscopic detection method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5720662A (en) * 1980-05-27 1982-02-03 Dow Chemical Co Ion exchange chromatography with indirect spectroscopic detection method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011512535A (en) * 2008-02-15 2011-04-21 シグマ−アルドリッチ・カンパニー Imidazolium-based dicationic liquid salt and method of use thereof
JP2011512536A (en) * 2008-02-15 2011-04-21 シグマ−アルドリッチ・カンパニー Dication liquid salt and method of use thereof
US8742331B2 (en) 2008-02-15 2014-06-03 Sigma-Aldrich, Co. Imidazolium-based liquid salts and methods of use thereof
US8980643B2 (en) 2008-02-15 2015-03-17 Sigma-Aldrich Co., Llc Dicationic liquid salts and methods of use thereof
JP2020060534A (en) * 2018-10-12 2020-04-16 国立大学法人福井大学 Anion detection method and kit therefor

Also Published As

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