JP5830299B2 - 微量金属の測定方法及び測定装置 - Google Patents
微量金属の測定方法及び測定装置 Download PDFInfo
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- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Description
δM(x)=Sc−1/3×δ(x) ・・・(1)
(式中、δM(x)は電極末端における濃度拡散層厚(m)、δ(x)は電極末端における境界層厚(m)、Scはシュミット数を表わす。なお、δM(x)及びδ(x)は共にxの関数であり、xは流れの始点からの電極末端までの流下方向距離(m)である。)で求められる濃度拡散層厚(δM(x))以下であることを特徴とする。このとき、前記測定対象液体を最適な条件下で通液させるために、ヒーターで加温して動粘度(m2・s−1)を低下させることが好ましい。
δM(x)=Sc−1/3×δ(x) ・・・(1)
(式中、δM(x)は電極末端における濃度拡散層厚(m)、δ(x)は電極末端における境界層厚(m)、Scはシュミット数を表わす。なお、δM(x)及びδ(x)は共にxの関数であり、xは流れの始点からの電極末端までの流下方向距離(m)である。)で求められる濃度拡散層厚(δM(x))以下であることを特徴とする。このとき、前記測定対象液体を最適な条件下で通液させるために、加温して動粘度(m2・s−1)を低下させるヒーターを有することが好ましい。
δM(x)=Sc−1/3×δ(x) ・・・(1)
(式中、δM(x)は電極末端における濃度拡散層厚(m)、δ(x)は電極末端における境界層厚(m)、Scはシュミット数を表わす。なお、δM(x)及びδ(x)は共にxの関数であり、xは流れの始点からの電極末端までの流下方向距離(m)である。)で求められる。
Sc=μ/D=η/ρD ・・・(2)
(式中、μは測定対象液体の動粘度(m2・s−1)、ηは測定対象液体の粘度(kg・m−1・s−1)、ρは測定対象液体の密度(kg・m−3)、Dは測定対象である金属の拡散係数(m2・s−1)を表わす。)で求められる。
D= kB・T/6πμR ・・・(3)
(式中、kBはボルツマン定数 1.3806504×10−23(J・K−1)、Tは液温(K)、μは測定対象液体の動粘度(m2・s−1)、Rは測定対象金属の粒子の径(原子径)(m)を表わす。)で求められる。
δ(x)=5・((μ・x)/U0)(1/2) ・・・(4)
(式中、μは測定対象液体の動粘度(m2・s−1)、xは流れの始点からの電極末端までの流下方向距離(m)、U0はフローセル内の平均流速(m・s−1)である。)で求められる。測定対象液体の動粘度μは、測定対象液体の粘度ηと測定対象液体の密度ρより算出できる。
前記試算と種々の検討より、本発明で用いる測定用流路の流路の短径は、濃度拡散層以下にすることで目的とする測定対象液体中の微量金属の測定を行う上で好ましい条件である。
図2に示した測定装置を用いて、以下の操作により測定を行った。
[短径と濃度拡散層厚との関係]
48質量%水酸化ナトリウム水溶液及び48質量%水酸化カリウム溶液に、それぞれニッケル3ppb及び銅3ppbの濃度となるように微量金属を添加し、これらの水溶液の温度を変化させたときの測定結果を、図2の測定装置を用いて調べた。
Claims (11)
- 微量金属成分を含む濃厚アルカリ溶液、濃厚塩溶液、溶融塩又は導電性ポリマー溶液からなる測定対象液体において、測定用流路に前記測定対象液体を通液させる工程と、
前記測定用流路における前記測定対象液体の通液中に、前記測定対象液体を作用極、対極及び参照極からなる測定用電極と接触させて微量金属成分に対してストリッピングボルタンメトリー法による電気化学測定を行う工程と、
前記電気化学測定により得られたデータに基づいて前記測定対象液体の微量金属成分の濃度を求める工程と、を有する微量金属の測定方法であって、
前記測定用流路の短径(前記作用極と該作用極と対向する壁面との間の厚さ)が、次の式(1)
δM(x)=Sc−1/3×δ(x) ・・・(1)
(式中、δM(x)は電極末端における濃度拡散層厚(m)、δ(x)は電極末端における境界層厚(m)、Scはシュミット数を表わす。なお、δM(x)及びδ(x)は共にxの関数であり、xは流れの始点からの電極末端までの流下方向距離(m)である。)で求められる濃度拡散層厚(δM(x))以下であることを特徴とする微量金属の測定方法。 - 前記測定用流路の短径が濃度拡散層厚(δM(x))以下となる通液条件とするために、前記測定用流路に通液させる前に、前記測定対象液体を加温して前記測定対象液体の動粘度を低下させる工程を備えることを特徴とする請求項1記載の微量金属の測定方法。
- 前記測定対象液体に含まれる微量金属成分の濃度が10ppb以下であることを特徴とする請求項1記載の微量金属の測定方法。
- 前記測定対象液体に含まれる微量金属成分が、水素よりもイオン化傾向の大きい金属成分である請求項1乃至3のいずれか1項記載の微量金属の測定方法。
- 前記測定用流路の短径が濃度拡散層厚(δM(x))以下となる通液条件とするために、前記測定用流路の後段に配置したシリンジポンプにより測定用流路内を陰圧にして、前記測定対象液体を前記測定用流路内に単位時間当たり一定量で通液させることを特徴とする請求項1乃至4のいずれか1項記載の微量金属の測定方法。
- 前記測定対象液体が、アルカリ金属、アルカリ土類金属、アンモニア誘導体又は導電性有機塩を主成分とすることを特徴とする請求項1乃至5のいずれか1項記載の微量金属の測定方法。
- 前記測定対象液体の主成分濃度が0.1mol/L以上であることを特徴とする請求項1乃至6のいずれか1項記載の微量金属の測定方法。
- 前記測定対象液体が、ライン通過中の測定対象液体の一部を測定用に採取したものであって、前記電気化学測定が終了した後、前記測定対象液体をライン中に返送することを特徴とする請求項1乃至7のいずれか1項記載の微量金属の測定方法。
- 微量の金属成分を含む濃厚アルカリ溶液、濃厚塩溶液、溶融塩又は導電性ポリマー溶液からなる測定対象液体を通液させる測定用流路を有するフローセルと、
前記フローセルの測定用流路内に設けられた作用極、対極及び参照極からなる測定用電極と、
前記測定用電極を用いてストリッピングボルタンメトリー法による電気化学測定を行い、得られたデータに基づいて前記測定対象液体中の金属濃度を求める電気化学測定手段と、
を有する微量金属の測定装置であって、
前記測定用流路の短径(前記作用極と該作用極と対向する壁面との間の厚さ)が、次の式(1)
δM(x)=Sc−1/3×δ(x) ・・・(1)
(式中、δM(x)は電極末端における濃度拡散層厚(m)、δ(x)は電極末端における境界層厚(m)、Scはシュミット数を表わす。なお、δM(x)及びδ(x)は共にxの関数であり、xは流れの始点からの電極末端までの流下方向距離(m)である。)で求められる濃度拡散層厚(δM(x))以下であることを特徴とする微量金属の測定装置。 - 前記測定対象液体を前記フローセルに通液させる前に、その動粘度を低下させるために前記測定対象液体を加温する加温手段を有することを特徴とする請求項9記載の微量金属の測定装置。
- 前記加温手段が、採取した試料溶液及び前記フローセルを内部に収容し、該内部雰囲気を所定温度に保持できることを特徴とする請求項10記載の微量金属の測定装置。
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