フローインジェクション分析法による環境水中のりん酸塩の定量  [in Japanese] Flow injection analysis of phosphates in environmental waters  [in Japanese]

Search this Article

Author(s)

Abstract

フローインジェクション分析法により各種環境水中のリン酸塩の定量を行った.発色試薬として強酸性のモリブデン(V)-モリブデン(VI)混合溶液を用いた.試料(0.5ml)はキャリヤー液(水あるいは人工海水)中に導入され,モリブデン試薬液流と合流後,140℃に加熱された反応チューブ(30m)を通る.反応時間約4分.この間に試料中のオルトリン酸は発色反応を,縮合リン酸は加水分解及び発色反応を受ける.生ずる青色錯体の830nmにおける吸収をモニターする.<BR>検出限界は3×10<SUP>-7</SUP>M(0.010ppm P),分析速度は1時間当たり30検体,繰り返し分析精度は相対標準偏差で,1×10<SUP>-6</SUP>M,1×10<SUP>-5</SUP>M,1×10<SUP>-4</SUP>Mの各試料についてそれぞれ4.0%,0.3%,0.2%である.河川水,海水,市水,井戸水を対象として分析を行ったところ,河川水,井戸水については十分検出できるが,海水,市水は濃度が低く更に検出感度を上げる必要があることが分かった.

High-pressure flow injection system developed for the determination of ortho- and polyphosphates was applied to the rapid analysis of phosphates in various environmental waters. A strongly acidic molybdenum (V) and molybdenum(VI) reagent was used so that hydrolysis of polyphosphates and color development of the resultant orthophosphate could be achieved simultaneously. A sample solution (0.5 ml) was introduced into a carrier stream of water via a loopvalve sample injector. The carrier stream meets a molybdenum reagent stream from another channel and flows together into a reaction tubing. For complete chemical reaction, the temperature of the reaction tubing (PTFE, 0.5 mm i.d., 1.5 mm o.d., 30 m) was maintained at 140°C. Residence time of the sample in the reaction tubing was about 4 min. The absorbance of heteropoly blue complex was monitored. at 830 nm. Sampling rate was 30 samples/h. Detection limit was 3×10<SUP>-7</SUP> M (0.010 ppm P). The precisions (C.V.) were 4.0 %, 0.3 % and 0.2 % for orthophosphate of 1×10<SUP>-6</SUP> M, 1×10<SUP>-5</SUP> M and 1×10<SUP>-4</SUP> M, respectively. It was found that the flow injection system was effective in determining phosphate in river and well water, but the concentrations of phosphate in sea water and tap water were too low to be monitored by the present system.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 30(7), 465-469, 1981

    The Japan Society for Analytical Chemistry

Cited by:  3

Codes

  • NII Article ID (NAID)
    110002908328
  • NII NACSIS-CAT ID (NCID)
    AN00222633
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0525-1931
  • NDL Article ID
    2321749
  • NDL Source Classification
    M033;PA43
  • NDL Source Classification
    ZP4(科学技術--化学・化学工業--分析化学)
  • NDL Call No.
    Z17-9
  • Data Source
    CJPref  NDL  NII-ELS  J-STAGE  NDL-Digital 
Page Top