JP6145757B2 - Arsenic detection method and arsenic detection paper - Google Patents

Arsenic detection method and arsenic detection paper Download PDF

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JP6145757B2
JP6145757B2 JP2013241979A JP2013241979A JP6145757B2 JP 6145757 B2 JP6145757 B2 JP 6145757B2 JP 2013241979 A JP2013241979 A JP 2013241979A JP 2013241979 A JP2013241979 A JP 2013241979A JP 6145757 B2 JP6145757 B2 JP 6145757B2
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喜人 和久井
喜人 和久井
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National Institute of Advanced Industrial Science and Technology AIST
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本発明は、ppmオーダー以下のヒ素の含有の有無及びその量を目視でも判定可能とするヒ素検出方法及びこれに用いるヒ素検出紙に関する。   The present invention relates to an arsenic detection method and an arsenic detection paper used therefor, in which the presence or absence and the amount of arsenic on the order of ppm or less can be visually determined.

ヒ素は多くの工業分野で使用される一方で、単体のヒ素だけでなくほとんどのヒ素化合物が人体にとって非常に有害である。そこで、古くからヒ素を検出する方法やこれを抽出する方法が多く提案されている。   While arsenic is used in many industrial fields, most arsenic compounds as well as single arsenic are very harmful to the human body. Therefore, many methods for detecting arsenic and methods for extracting this have been proposed for a long time.

例えば、非特許文献1では、グートツァイト法(Gutzeit's test)と称されるヒ素の検出方法について述べている。ヒ素化合物を水素で還元し、生じたアルシンAsH3を臭化第二水銀紙に接触させると褐色に発色することでその検出が可能である。一般的に、ヒ素の検出精度としては高感度とされるが、やはり人体に有害である水銀化合物を使用しなければならない。 For example, Non-Patent Document 1 describes an arsenic detection method called the Gutzeit's test. When the arsenic compound is reduced with hydrogen and the resulting arsine AsH 3 is brought into contact with mercuric bromide paper, it can be detected by developing a brown color. In general, arsenic detection accuracy is high sensitivity, but mercury compounds that are also harmful to the human body must be used.

非特許文献2では、JIS K0102における工場排水の試験方法や、JIS M8132における鉱石中のヒ素定量方法の原理となるジエチルジチオカルバミン酸銀法(銀DDTC法)について述べている。上記方法と同様に、ヒ素化合物を水素で還元し、生じたアルシンAsH3を銀DDTC錯体溶液に吸収させ、赤紫色の錯化合物の吸光度を吸光光度計により測定し定量化するのである。 Non-Patent Document 2 describes the method for testing industrial wastewater in JIS K0102, and the silver diethyldithiocarbamate method (silver DDTC method) which is the principle of the arsenic determination method in ores in JIS M8132. In the same manner as described above, the arsenic compound is reduced with hydrogen, and the resulting arsine AsH 3 is absorbed into the silver DDTC complex solution, and the absorbance of the red-purple complex compound is measured and quantified with an absorptiometer.

また、特許文献1でも、ジエチルジチオカルバミン酸銀を用い、吸光光度計によりヒ素を定量分析する方法を開示している。ここでは、燃焼炉から排出される石炭灰等に含まれるヒ素の定量化を目的としているため、検体を1700℃以上の高温に加熱しヒ素を揮散させ、発生したガス体を硫酸、塩酸、塩化第1錫及び亜鉛の混合物中を通過させて還元させアルシンAsH3を得ている。 Patent Document 1 also discloses a method for quantitatively analyzing arsenic using an absorptiometer using silver diethyldithiocarbamate. Here, since the purpose is to quantify arsenic contained in coal ash discharged from the combustion furnace, the specimen is heated to a high temperature of 1700 ° C or higher to volatilize arsenic, and the generated gas body is sulfuric acid, hydrochloric acid, chloride. It is reduced by passing through a mixture of stannous and zinc to obtain arsine AsH 3 .

更に、例えば、工業排水や電子基板のエッチング液中などに微量含有される三価ヒ素イオンを分離、除去する方法として、ジエチルジチオカルバメートやピロリジンジチオカルバメートといった化合物を含む有機試薬を用いた溶媒抽出法が知られている。ところが、これらの化合物ではケロシン等の非極性溶媒への溶解性が低く、また水相中に脱離しやすいとされている。   Furthermore, for example, as a method for separating and removing trivalent arsenic ions contained in trace amounts in industrial wastewater or in an etching solution for electronic substrates, a solvent extraction method using an organic reagent containing a compound such as diethyldithiocarbamate or pyrrolidinedithiocarbamate It has been known. However, these compounds are considered to have low solubility in nonpolar solvents such as kerosene and are easily desorbed in the aqueous phase.

これに対して、特許文献2では、三価ヒ素イオンの希薄水溶液からヒ素を簡単な操作で分離、除去し抽出する方法として、ビス(2−エチルヘキシル)アンモニウム ビス(2−エチルヘキシル)ジチオカルバメート、ジヘキシルアンモニウム ジヘキシルジチオカルバメート、ジオクチルアンモニウムジオクチルジチオカルバメート等の化合物を用いた方法を開示している。ここでは、三価ヒ素イオンを含有する水溶液がヒ素を遊離亜ヒ酸(H3 AsO3)の形で含有していれば、アルカリ金属イオンやハロゲン化物イオン、硝酸イオン、硫酸イオンなどと共存していても抽出が可能であって、安定した抽出が可能であるとしている。 On the other hand, in Patent Document 2, bis (2-ethylhexyl) ammonium bis (2-ethylhexyl) dithiocarbamate, dihexyl is used as a method for separating, removing and extracting arsenic from a dilute aqueous solution of trivalent arsenic ions. Disclosed are methods using compounds such as ammonium dihexyl dithiocarbamate, dioctyl ammonium dioctyl dithiocarbamate and the like. Here, if the aqueous solution containing trivalent arsenic ions contains arsenic in the form of free arsenous acid (H 3 AsO 3 ), it coexists with alkali metal ions, halide ions, nitrate ions, sulfate ions, etc. However, it is possible to extract and stable extraction is possible.

実開平1−84063号公報Japanese Utility Model Publication No. 1-84063 特開平10−137504号公報Japanese Patent Laid-Open No. 10-137504

Industrial and Engineering Chemistry, Vol.2,No.1, p29, 1930.Industrial and Engineering Chemistry, Vol.2, No.1, p29, 1930. 分析化学 Vol. 13, p780, 1964.Analytical Chemistry Vol. 13, p780, 1964.

排水基準(0.1ppm)であるppmオーダー以下のヒ素の含有の有無を目視でも判定可能とするヒ素検出方法が求められている。かかる方法において、環境中や工場などの作業現場で簡易且つ簡便にヒ素の検出を行うためには、複雑な前処理や高度な測定機器を必要とせず、且つ、有害金属や多量の有機溶剤を使用せず、更に、環境中に存在する元素の影響を受けないことも必要となる。   There is a need for an arsenic detection method that can visually determine whether or not arsenic is contained in the order of ppm or less, which is a wastewater standard (0.1 ppm). In such a method, in order to detect arsenic simply and easily in the environment or at a work site such as a factory, complicated pretreatment and advanced measurement equipment are not required, and harmful metals and a large amount of organic solvent are not used. It is also necessary not to use it and to be unaffected by the elements present in the environment.

本発明は、以上のような状況に鑑みてなされたものであって、その目的とするところは、ppmオーダー以下のヒ素の含有の有無及びその量を簡易且つ簡便に目視でも判定可能とするヒ素検出方法及びこれに用いるヒ素検出紙の提供にある。   The present invention has been made in view of the situation as described above, and the object of the present invention is to make it possible to easily and easily visually determine whether or not arsenic is contained in the order of ppm or less and its amount. The present invention provides a detection method and an arsenic detection paper used therefor.

本発明によるヒ素検出方法は、ヒ素を含み得る水溶液をガス化処理して得たガス体をビス(2−エチルヘキシル)ジチオカルバメート銀を担持させた通気性フィルタを通過させることを特徴とする。   The arsenic detection method according to the present invention is characterized in that a gas body obtained by gasifying an aqueous solution containing arsenic is passed through a breathable filter carrying silver bis (2-ethylhexyl) dithiocarbamate.

かかる発明によれば、複雑な前処理や高度な測定機器を必要とせず、且つ、有害金属や多量の有機溶剤を使用せず、ppmオーダー以下のヒ素の含有の有無を発色にて目視でも判定可能であり、発色の濃度と色相の相関によりその定量化も可能である。また、環境中に存在する元素の影響を受けずに判定が可能である。   According to this invention, complicated pretreatment and advanced measurement equipment are not required, and no toxic metal or a large amount of organic solvent is used, and whether or not arsenic is contained in the order of ppm or less is visually determined by color development. It is possible to quantify the color density by correlating color density and hue. Further, the determination can be made without being affected by the elements present in the environment.

上記した発明において、有機溶剤とともにビス(2−エチルヘキシル)ジチオカルバメート銀錯体を前記通気性フィルタに与え、前記有機溶剤を揮散させてからこれに前記ガス体を通過させることを特徴としてもよい。また、トリ−n−デシルアミン若しくはトリラウリルアミンを前記有機溶剤に加えたことを特徴としてもよい。かかる発明によれば、複雑な前処理を必要とせず、且つ、有害金属や多量の有機溶剤を使用せず、ppmオーダー以下のヒ素の含有の有無を発色にて目視でも判定可能であり、発色の濃度と色相の相関によりその定量化も可能である。   In the above-described invention, a bis (2-ethylhexyl) dithiocarbamate silver complex together with an organic solvent may be applied to the air-permeable filter, and the organic solvent may be volatilized before allowing the gas body to pass therethrough. Further, tri-n-decylamine or trilaurylamine may be added to the organic solvent. According to this invention, no complicated pretreatment is required, no harmful metals or a large amount of organic solvent are used, and the presence or absence of arsenic in the order of ppm or less can be visually determined. It can be quantified by the correlation between the density of the color and the hue.

上記した発明において、前記ガス化処理は前記水溶液中に含み得るヒ素をアルシンとする処理であることを特徴としてもよい。かかる発明によれば、複雑な前処理を必要とせず、ppmオーダー以下のヒ素の含有の有無を発色にて目視でも判定可能であり、発色の濃度と色相の相関によりその定量も可能である。   In the above-described invention, the gasification treatment may be a treatment using arsine as arsenic that may be contained in the aqueous solution. According to this invention, it is possible to visually determine whether or not arsenic is contained in the order of ppm or less by color development without requiring a complicated pretreatment, and it is possible to determine the amount by correlating the color density and hue.

上記した発明において、前記通気性フィルタはガラス繊維からなることを特徴としてもよい。かかる発明によれば、ppmオーダー以下のヒ素の含有の有無を発色にて特に目視でも判定可能となり、発色の濃度と色相の相関によりその定量も可能である。   In the above-described invention, the breathable filter may be made of glass fiber. According to this invention, it is possible to visually determine the presence or absence of arsenic in the order of ppm or less by color development, and it is possible to determine the amount by correlating the color density and hue.

更に、本発明によるヒ素検出紙は、通気性フィルタにビス(2−エチルヘキシル)ジチオカルバメート銀を担持させたことを特徴とする。   Furthermore, the arsenic detection paper according to the present invention is characterized in that bis (2-ethylhexyl) dithiocarbamate silver is supported on a breathable filter.

かかる発明によれば、複雑な前処理や高度な測定機器を必要とせず、且つ、有害金属や多量の有機溶剤を使用せず、ppmオーダー以下のヒ素の含有の有無を発色にて目視でも判定可能とし、発色の濃度と色相の相関を与えてその定量化も可能である。   According to this invention, complicated pretreatment and advanced measurement equipment are not required, and no toxic metal or a large amount of organic solvent is used, and whether or not arsenic is contained in the order of ppm or less is visually determined by color development. It is possible to quantify the color density by giving a correlation between color density and hue.

上記した発明において、有機溶剤とともにビス(2−エチルヘキシル)ジチオカルバメート銀錯体を前記通気性フィルタに与え前記有機溶剤を揮散させてなることを特徴としてもよい。また、トリ−n−デシルアミン若しくはトリラウリルアミンを前記有機溶剤に加えたことを特徴としてもよい。かかる発明によれば、複雑な前処理を必要とせず、且つ、有害金属や多量の有機溶剤を使用せず、ppmオーダー以下のヒ素の含有の有無を発色にて目視でも判定可能であり、発色の濃度と色相の相関によりその定量化も可能である。   In the above-described invention, a bis (2-ethylhexyl) dithiocarbamate silver complex may be given to the breathable filter together with an organic solvent to volatilize the organic solvent. Further, tri-n-decylamine or trilaurylamine may be added to the organic solvent. According to this invention, no complicated pretreatment is required, no harmful metals or a large amount of organic solvent are used, and the presence or absence of arsenic in the order of ppm or less can be visually determined. It can be quantified by the correlation between the density of the color and the hue.

上記した発明において、前記通気性フィルタはガラス繊維からなることを特徴としてもよい。かかる発明によれば、ppmオーダー以下のヒ素の含有の有無を発色にて特に目視でも判定可能となり、発色の濃度と色相の相関によりその定量も可能である。   In the above-described invention, the breathable filter may be made of glass fiber. According to this invention, it is possible to visually determine the presence or absence of arsenic in the order of ppm or less by color development, and it is possible to determine the amount by correlating the color density and hue.

本発明によるヒ素検出紙の製造方法を示すフロー図である。It is a flowchart which shows the manufacturing method of the arsenic detection paper by this invention. 本発明によるヒ素検出・定量方法を示すフロー図である。It is a flowchart which shows the arsenic detection and determination method by this invention. 本発明によるヒ素検出方法における装置例を示す図である。It is a figure which shows the example of an apparatus in the arsenic detection method by this invention. 本発明によるヒ素検出紙におけるヒ素濃度に対する色差変化を示すグラフである。It is a graph which shows the color difference change with respect to the arsenic density in the arsenic detection paper by this invention. 本発明によるヒ素検出紙における色差変化の時間変化を示すグラフである。It is a graph which shows the time change of the color difference change in the arsenic detection paper by this invention. 本発明によるヒ素検出紙の時間変化に対するアミン添加の影響を示すグラフである。It is a graph which shows the influence of amine addition with respect to the time change of the arsenic detection paper by this invention. 本発明によるヒ素検出紙における共存イオン種の色差変化に与える影響の一覧である。It is a list of the influence which it has on the color difference change of the coexisting ion species in the arsenic detection paper by this invention. 本発明によるヒ素検出紙におけるフィルタの種類及び物理特性と色差変化の一覧である。6 is a list of filter types, physical characteristics, and color difference changes in the arsenic detection paper according to the present invention.

本発明によるヒ素検出方法は、主として、ビス(2−エチルヘキシル)ジチオカルバメート銀とアルシンAsH3との反応による発色を利用するものである。かかる原理を利用したヒ素検出紙の製造方法及びこれを用いたヒ素の検出方法の1つの実施例について図1及び図2に沿ってその詳細を説明する。 The arsenic detection method according to the present invention mainly uses color development by the reaction of silver bis (2-ethylhexyl) dithiocarbamate and arsine AsH 3 . The details of one embodiment of a method for producing arsenic detection paper using this principle and a method for detecting arsenic using the same will be described with reference to FIGS.

[ヒ素検出紙の製造]
図1に沿って示すように、まず、ビス(2−エチルヘキシル)アミンに1/2等量の二硫化炭素を混合し、室温で一晩攪拌し、ビス(2−エチルヘキシル)ジチオカルバメート ビス(2−エチルヘキシル)アンモニウム塩(BBDC)を調製する(S1)。
[Manufacture of arsenic detection paper]
As shown in FIG. 1, first, bis (2-ethylhexyl) amine was mixed with 1/2 equivalent of carbon disulfide, stirred overnight at room temperature, and bis (2-ethylhexyl) dithiocarbamate bis (2 -Ethylhexyl) ammonium salt (BBDC) is prepared (S1).

次に、0.02MのBBDCヘプタン溶液20mlに0.02Mの酢酸銀溶液19mlを接触させ、30分振とうし、有機相にビス(2−エチルヘキシル)ジチオカルバメート銀錯体を生成させる(S2)。   Next, 19 ml of 0.02M silver acetate solution is brought into contact with 20 ml of 0.02M BBDC heptane solution and shaken for 30 minutes to form a bis (2-ethylhexyl) dithiocarbamate silver complex in the organic phase (S2).

ガス透過性を有する通気性フィルタを用意し、例えば、直径25mmのグラスファイバ製フィルタを用意し、ビス(2−エチルヘキシル)ジチオカルバメート銀錯体を含む有機相0.5mlを含浸付与する(S3)。また、必要に応じて、アミン、特に、トリ−n−デシルアミン若しくはトリラウリルアミンを有機相に加えて含浸付与してもよい。これについては後述する。   A gas-permeable breathable filter is prepared, for example, a glass fiber filter having a diameter of 25 mm is prepared, and impregnated with 0.5 ml of an organic phase containing a bis (2-ethylhexyl) dithiocarbamate silver complex (S3). In addition, if necessary, an amine, particularly tri-n-decylamine or trilaurylamine may be added to the organic phase for impregnation. This will be described later.

次に、通気性フィルタを室温で放置し溶剤を揮散させてビス(2−エチルヘキシル)ジチオカルバメート銀を担持させたヒ素検出紙(検出膜)を得る(S4)。   Next, the air permeable filter is allowed to stand at room temperature to evaporate the solvent to obtain an arsenic detection paper (detection film) carrying bis (2-ethylhexyl) dithiocarbamate silver (S4).

[ヒ素の検出・定量]
図2及び図3に示すように、100mlのフラスコ11にヒ素を含む検体溶液20mlを入れ、5Mの塩酸20ml、0.18Mの塩化スズ(II)溶液を5ml加え、全体を水で60mlに調製した。これに亜鉛粉末3.0gを加えガス化処理する(s1)。つまり、ヒ素が含まれているならアルシンAsH3を発生させる。
[Detection and quantification of arsenic]
As shown in FIG. 2 and FIG. 3, 20 ml of a specimen solution containing arsenic is placed in a 100 ml flask 11 and 20 ml of 5M hydrochloric acid and 5 ml of 0.18M tin (II) chloride solution are added, and the whole is prepared to 60 ml with water. did. To this, 3.0 g of zinc powder is added and gasified (s1). That is, if arsenic is contained, arsine AsH 3 is generated.

上記したヒ素検出紙13をフィルタホルダ12に固定し、これをフラスコの口14に配置させて接続し、1時間放置しヒ素検出紙13にガスを通気させる(s2、図3(b)参照)。   The above-mentioned arsenic detection paper 13 is fixed to the filter holder 12, and is placed and connected to the mouth 14 of the flask. .

ヒ素検出紙13の色の変化を目視にて確認し、ヒ素の含有の有無を検出する(s3)。また、必要に応じて、ヒ素検出紙13を色相計で測定し、発色の濃度と色相の相関からヒ素量を定量化する(s4)。   The color change of the arsenic detection paper 13 is visually confirmed to detect the presence or absence of arsenic (s3). If necessary, the arsenic detection paper 13 is measured with a hue meter, and the amount of arsenic is quantified from the correlation between the color density and the hue (s4).

ここで色相計を用いたヒ素量の定量化には、明度をL*、色相と彩度を示す色度をa*、b*で表わすL***表色系の値で行い得る。つまり、ガス通気前のヒ素検出紙及びガス通気後のヒ素検出紙13における明度L*、色度a*、b*の各値の変化をΔL*、Δa*、Δb*とすると、色の変化(色差)ΔE*(ab)は、
ΔE*(ab)=((ΔL*)+(Δa*)+(Δb*))1/2
で与えられる。つまり、予め既知のヒ素量に対する色差ΔE*(ab)の値を検定線として得ておくことでヒ素量の定量化ができるのである。
Here, quantification of the amount of arsenic using a hue meter can be carried out using L * , lightness and L * a * b * color system values representing hue and saturation as a * and b *. . That is, if the changes in the values of lightness L * , chromaticity a * , and b * in the arsenic detection paper 13 before gas ventilation and the arsenic detection paper 13 after gas ventilation are ΔL * , Δa * , Δb * , the color change (Color difference) ΔE * (ab) is
ΔE * (ab) = ((ΔL * ) 2 + (Δa * ) 2 + (Δb * ) 2 ) 1/2
Given in. That is, the amount of arsenic can be quantified by previously obtaining the value of the color difference ΔE * (ab) with respect to the known amount of arsenic as a test line.

図4には、0,10,20,50,100ppbのヒ素を含む各溶液にて、上記したようにヒ素検出紙13にガス化したガスを通気し、色差ΔE*(ab)を測定した結果を示した。これから判るように、10〜100ppbにおいて、ヒ素濃度の上昇に伴い連続的に発色が強くなる傾向にある。かかるヒ素濃度と色差ΔE*(ab)とからなる検定線を用いてヒ素の高感度な定量分析が可能である。 FIG. 4 shows the result of measuring the color difference ΔE * (ab) by passing the gasified gas through the arsenic detection paper 13 as described above in each solution containing arsenic of 0, 10, 20, 50, and 100 ppb. showed that. As can be seen from this, at 10 to 100 ppb, the color development tends to increase continuously as the arsenic concentration increases. High-sensitivity quantitative analysis of arsenic is possible using a calibration line composed of the arsenic concentration and the color difference ΔE * (ab).

なお、比較例として、銀DDTC錯体溶液を同様に通気性フィルタに含浸付与して得たヒ素検出紙では、アルシンAsH3を通気しても発色は得られなかった。 As a comparative example, in an arsenic detection paper obtained by impregnating a breathable filter with a silver DDTC complex solution, no color was obtained even when arsine AsH 3 was vented.

[ヒ素検定紙の評価1]
図5には、0.1ppmのヒ素溶液にて発色させたヒ素検出紙13を空気中に放置し、所定時間毎に色差ΔE*(ab)を測定した結果を示した。これから判るように、6時間経過後でも変化は5%以内であり、色差ΔE*(ab)は非常に安定している。つまり、本実施例のヒ素検出紙13は、時間経過に関わらず、安定して精度良くヒ素量を定量化できるのである。
[Evaluation of arsenic test paper 1]
FIG. 5 shows the results of measuring the color difference ΔE * (ab) every predetermined time by leaving the arsenic detection paper 13 colored with a 0.1 ppm arsenic solution in the air. As can be seen, even after 6 hours, the change is within 5%, and the color difference ΔE * (ab) is very stable. That is, the arsenic detection paper 13 of this embodiment can quantitate the amount of arsenic stably and accurately regardless of the passage of time.

[ヒ素検定紙の評価2]
図6には、ビス(2−エチルヘキシル)ジチオカルバメート銀錯体を含む有機相を含浸付与するステップ(S3)において、該錯体と等モルのアミンを添加したときにおいて、ヒ素検出紙13を空気中に放置し、所定時間後に、0.1ppmのヒ素溶液にてヒ素検出紙13を発色させ、経過時間と色差ΔE*(ab)を測定した結果の相関を示した。これから判るように、アミンの添加をしなかった場合、及び、ビス(2−エチルヘキシル)アミンを添加した場合に対して、トリ−n−デシルアミン及びトリラウリルアミンを添加した場合には、より長時間に亘り発色が維持できるのである。
[Evaluation of arsenic test paper 2]
In FIG. 6, in the step of impregnating the organic phase containing the bis (2-ethylhexyl) dithiocarbamate silver complex (S3), when an equimolar amount of amine is added to the complex, the arsenic detection paper 13 is placed in the air. The arsenic detection paper 13 was colored with a 0.1 ppm arsenic solution after a predetermined time, and the correlation between the elapsed time and the color difference ΔE * (ab) was measured. As can be seen from this, when no amine was added and when bis (2-ethylhexyl) amine was added, when tri-n-decylamine and trilaurylamine were added, the time was longer. The color development can be maintained over this period.

[ヒ素検定紙の評価3]
図7には、各種のイオン種が測定に与える影響を一覧にした。ここでは、0.1ppmのヒ素溶液に100倍量(10ppm)の各種イオンを共存させ、上記したようにヒ素検出紙13にガス化したガスを通気し、色差ΔE*(ab)を測定した。その上で、共存イオンが存在する場合と、存在しない場合における色差ΔE*(ab)の差(Δ(ΔE*(ab))を計算している。なお、セレン及びアンチモン以外では肉眼においてその差を検出できない程度であった。これからわかるように、環境中に存在する元素、特に、リン等の影響を受けないことから、本実施例のヒ素検定紙13は簡易且つ簡便に精度よく測定が可能である。
[Evaluation of arsenic test paper 3]
FIG. 7 lists the effects of various ion species on the measurement. Here, 100 times (10 ppm) of various ions coexist in a 0.1 ppm arsenic solution, gasified gas was passed through the arsenic detection paper 13 as described above, and the color difference ΔE * (ab) was measured. In addition, the difference (Δ (ΔE * (ab)) of the color difference ΔE * (ab) between the presence and absence of the coexisting ions is calculated. As can be seen, the arsenic test paper 13 of this example can be measured easily and simply with high accuracy since it is not affected by elements present in the environment, particularly phosphorus. It is.

[ヒ素検定紙の評価4]
図8には、各種の通気性フィルタに上記したようにビス(2−エチルヘキシル)ジチオカルバメート銀錯体を含む有機相を含浸させ得られたヒ素検出紙による色差ΔE*(ab)を測定した結果を示した。ここでは、0.1ppmのヒ素溶液20mlをガス化したガスをヒ素検出紙に通気し、色差ΔE*(ab)を測定した。なお、ガス化したガスに含まれるアルシンは、反応時に発生する水素をキャリアとして運ばれるため、水素透過性も測定した。
[Evaluation of arsenic test paper 4]
FIG. 8 shows the results of measuring the color difference ΔE * (ab) with arsenic detection paper obtained by impregnating various air-permeable filters with an organic phase containing a bis (2-ethylhexyl) dithiocarbamate silver complex as described above. Indicated. Here, a gas obtained by gasifying 20 ml of a 0.1 ppm arsenic solution was passed through an arsenic detection paper, and the color difference ΔE * (ab) was measured. Since arsine contained in the gasified gas is transported with hydrogen generated during the reaction as a carrier, hydrogen permeability was also measured.

これによれば、セルロースからなる通気性フィルタにおいて、No.3及び4の目が細かく水素透過係数の小さい、すなわちガス透過性の低いフィルタでは発色性が低かった。一方、No.1,2,6及び7のように、目を粗くし、ガス透過性を高めると、発色性が向上し、特に、No.1で良好な発色性を示した。また、No.5の目の粗く、厚さの薄いフィルタでは、発色性が低下したが、これは十分にアルシンとBBDCの接触が得られなかったことに起因すると考える。   According to this, in the air permeable filter made of cellulose, the No. 3 and No. 4 eyes were fine and the hydrogen permeability coefficient was small, that is, the filter with low gas permeability had low color development. On the other hand, when the eyes were roughened and the gas permeability was increased as in Nos. 1, 2, 6 and 7, the color developability was improved, and in particular, No. 1 showed good color developability. In addition, the No. 5 coarse filter and the thin filter showed a decrease in color developability, but this is considered to be due to insufficient contact between arsine and BBDC.

更に、酢酸セルロースからなるメンブレンフィルタも発色性は一定程度を得ることができ、グラスファイバからなるガラス繊維フィルタでは水素透過係数はそれほど大きくないにもかかわらず、発色性は高かった。これは、フィルタ繊維内部にBBDCが浸潤せず、表面に滞留し、フィルタ表面でヒ素との反応が生じ、外部からの発色性の確認が容易であったためと考える。   Further, the membrane filter made of cellulose acetate can obtain a certain level of color developability, and the glass fiber filter made of glass fiber has high color developability although the hydrogen permeation coefficient is not so large. This is thought to be because BBDC did not infiltrate inside the filter fibers and stayed on the surface, causing a reaction with arsenic on the filter surface, and it was easy to confirm the color developability from the outside.

以上、本実施例によれば、複雑な前処理や高度な測定機器を必要とせず、且つ、有害金属や多量の有機溶剤を使用せず、ppmオーダー以下のヒ素の含有の有無を発色にて目視でも判定可能とし、更に、色相計により発色の濃度と色相の相関を得ることでその定量化も可能となる。   As described above, according to the present embodiment, complicated pretreatment and advanced measurement equipment are not required, and no toxic metal or a large amount of organic solvent is used. The determination can be made visually, and further, the color can be quantified by obtaining the correlation between the color density and the hue with a hue meter.

ここまで本発明による代表的実施例及びこれに基づく改変例について説明したが、本発明は必ずしもこれらに限定されるものではない。当業者であれば、添付した特許請求の範囲を逸脱することなく、種々の代替実施例を見出すことができるだろう。   So far, representative examples and modified examples based on the examples have been described, but the present invention is not necessarily limited thereto. Those skilled in the art will recognize a variety of alternative embodiments without departing from the scope of the appended claims.

11 フラスコ
12 フィルタホルダ
13 ヒ素検出紙
11 Flask 12 Filter holder 13 Arsenic detection paper

Claims (9)

ヒ素を含み得る水溶液をガス化処理して得たガス体をビス(2−エチルヘキシル)ジチオカルバメート銀を担持させた通気性フィルタを通過させることを特徴とするヒ素検出方法。   A method for detecting arsenic, comprising: passing a gas body obtained by gasifying an aqueous solution containing arsenic through a gas-permeable filter carrying silver bis (2-ethylhexyl) dithiocarbamate. 有機溶剤とともにビス(2−エチルヘキシル)ジチオカルバメート銀錯体を前記通気性フィルタに与え、前記有機溶剤を揮散させてからこれに前記ガス体を通過させることを特徴とする請求項1記載のヒ素検出方法。   2. The arsenic detection method according to claim 1, wherein a bis (2-ethylhexyl) dithiocarbamate silver complex is given to the air-permeable filter together with an organic solvent, and the gas is passed through the organic solvent after volatilizing the organic solvent. . トリ−n−デシルアミン若しくはトリラウリルアミンを前記有機溶剤に加えたことを特徴とする請求項2記載のヒ素検出方法。   The arsenic detection method according to claim 2, wherein tri-n-decylamine or trilaurylamine is added to the organic solvent. 前記ガス化処理は前記水溶液中に含み得るヒ素をアルシンとする処理であることを特徴とする請求項1乃至3のうちの1つに記載のヒ素検出方法。   4. The arsenic detection method according to claim 1, wherein the gasification treatment is a treatment in which arsenic that can be contained in the aqueous solution is arsine. 前記通気性フィルタはガラス繊維からなることを特徴とする請求項1乃至4のうちの1つに記載のヒ素検出方法。   5. The arsenic detection method according to claim 1, wherein the breathable filter is made of glass fiber. 通気性フィルタにビス(2−エチルヘキシル)ジチオカルバメート銀を担持させたことを特徴とするヒ素検出紙。   An arsenic detection paper, characterized in that bis (2-ethylhexyl) dithiocarbamate silver is supported on a breathable filter. 有機溶剤とともにビス(2−エチルヘキシル)ジチオカルバメート銀錯体を前記通気性フィルタに与え前記有機溶剤を揮散させてなることを特徴とする請求項6記載のヒ素検出紙。   The arsenic detection paper according to claim 6, wherein a bis (2-ethylhexyl) dithiocarbamate silver complex is given to the breathable filter together with an organic solvent to volatilize the organic solvent. トリ−n−デシルアミン若しくはトリラウリルアミンを前記有機溶剤に加えたことを特徴とする請求項7記載のヒ素検出紙。   The arsenic detection paper according to claim 7, wherein tri-n-decylamine or trilaurylamine is added to the organic solvent. 前記通気性フィルタはガラス繊維からなることを特徴とする請求項6乃至8のうちの1つに記載のヒ素検出紙。
The arsenic detection paper according to claim 6, wherein the breathable filter is made of glass fiber.
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