JP5567950B2 - りん酸とシリカイオン存在下における希薄砒素濃度の測定方法 - Google Patents
りん酸とシリカイオン存在下における希薄砒素濃度の測定方法 Download PDFInfo
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Description
即ち、特許文献1は、試料液を酸性の液性下において、生成するヘテロポリ酸錯体の還元剤である硫酸ヒドラジンと、砒素の反応を抑制するマスキング剤である酒石酸ナトリウムカリウムと共にモリブデン酸アンモニウム液と短時間加熱反応させた後に試料液の吸光度を測定し、さらに上記反応を進めた後にもう一度、試料液の吸光度を測定し、先に測定した吸光度と次に測定した吸光度の差から砒素濃度を求める方法である。この方法は、砒素とりん酸イオンのモリブデン酸ナトリウムに対する反応速度の差を利用したものである。しかし、りん酸と同様にモリブデン酸アンモニウムに反応するシリカの影響を除外する方法については一切記載されていない。この方法は、りん酸と砒素のみが共存する試料については有効であるが、表1の通り、測定対象の砒素濃度に対し約4,000倍のシリカイオンが存在するような試料については、正しい砒素濃度を測定することができない。
(1):ジエチルジチオカルバミド酸銀吸光光度法
(2):水素化物発生原子吸光法
(3):水素化物発生ICP発光分光分析法
(4):ICP質量分析法
砒素を含む排水の一般的処理方法は、第二鉄塩との共沈法である。この方法では、反応槽に第二鉄塩を添加しながらアルカリ剤も加えpH調整し、砒素を含む鉄殿物を生成させ、その後凝集反応槽で高分子凝集剤を添加し、砒素を含む鉄殿物を凝集させ、最後にシックナーや清澄池で砒素を含む鉄殿物を沈降させ、清澄な上澄水を処理水として放流する。本発明の砒素測定装置は、このような処理水中の砒素濃度の連続モニタリングなどに活用するが、シックナーや清澄池での固液分離は完全ではないので、処理水にSSが存在する。前述した通り、我が国の排水基準や環境基準はSSを含む総砒素に対する規制なので、連続モニタリングにおいてもSSを溶解した後の試料液を測定対象にしなければならない。
先ず、第一段階の手順として、試料液や標準液の酸化剤は過マンガン酸カリウム溶液(0.08g/L)を、還元剤として塩化ヒドロキシルアンモニウム溶液(0.1g/L)を使用した。試料液あるいは標準液はサンプルループに500μL溜め、酸化剤あるいは還元剤はサンプルループに600μL溜め、各々ドデシル硫酸ナトリウム(0.5g/L)を溶解添加したキャリア(水)で0.6mL/minの流速で管路に導入した。
次に、第二段階の手順として、発色剤は、モリブデン酸アンモニウム(5g/L)とビス[(+)-タルトラト]二アンチモン酸二カリウム三水和物(0.2g/L)およびアスコルビン酸(6g/L)の混合液(2.4Nの硫酸酸性)を使用し、この発色剤にさらにドデシル硫酸ナトリウム(0.5g/L)を溶解添加し、0.2mL/minの流速で管路に導入した。
砒素の標準液は三酸化二砒素からなる溶液を使用した。
Claims (5)
- りん酸とシリカイオンが存在する試料液中の希薄な砒素濃度を、モリブデン酸アンモニウムを使ったフローインジェクション分析に基づいて測定する方法であって、前記試料を塩酸でpH2.0に調整して懸濁物質を溶解して試料液とし、酸化剤あるいは還元剤を前記試料液に混合すると同時に、ドデシル硫酸ナトリウム水溶液を前記試料液に供給した後に、発色剤であるモリブデン酸アンモニウムの溶解液を前記試料液に供給して70℃に加温し、さらに冷却し、前記酸化剤によってりん酸と砒素を測定すると同時に、前記還元剤によってりん酸を測定し、前記酸化剤を用いて測定したりん酸と砒素の合計と、還元剤を用いて測定したりん酸の差から砒素濃度を求めることを特徴とする、りん酸とシリカイオン存在下における希薄砒素濃度の測定方法。
- 発色剤との反応時間は約1.4分であり、吸光度を測定し砒素濃度を求める請求項1記載のりん酸とシリカイオン存在下における希薄砒素濃度の測定方法。
- 酸化剤は過マンガン酸カリウム、還元剤は塩化ヒドロキシルアンモニウム、発色剤はモリブデン酸アンモニウムとビス[(+)-タルトラト]二アンチモン酸二カリウム三水和物、及びアスコルビン酸の混合液である請求項1又は2記載のりん酸とシリカイオン存在下における希薄砒素濃度の測定方法。
- (試料液+酸化剤)の条件で測定した吸光度をA1、(試料液+還元剤)の条件で測定した吸光度をA2、(水+還元剤)の条件で測定した吸光度をA3とし、前記試料液の総砒素濃度Cを、C=A1−(A2−A3)の関係と検量線から求める請求項1記載のりん酸とシリカイオン存在下における希薄砒素濃度の測定方法。ただし、A3に関連する水は、砒素濃度が0mg/Lの標準液を示し、検量線とは、複数の砒素濃度既知の標準液を使い作成した、砒素濃度と吸光度の関係を表す直線を示す。
- 試料液あるいは標準液のうちの一つをサンプルループに溜めると共に、酸化剤あるいは還元剤のいずれか一つもサンプルループに溜め、これらを同時にキャリア(水)で管路に流し込み室温の反応コイルで反応させ、その後発色剤溶液と混合し恒温槽内の反応コイルで反応させ、冷却コイルを通過後880nmで吸光度を測定する請求項1〜4のいずれか記載の希薄砒素濃度の測定方法。
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JP3697430B2 (ja) * | 2002-07-29 | 2005-09-21 | 株式会社東北テクノアーチ | 水中微量成分の測定方法及び装置 |
JP4075664B2 (ja) * | 2003-03-31 | 2008-04-16 | 三菱マテリアル株式会社 | ヒ素濃度の測定方法と装置 |
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