Determination of formaldehyde in water by chemiluminescence after derivatization.

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Other Title
  • 誘導体化‐連続流れ方式・化学発光法による水中ホルムアルデヒドの定量
  • ユウドウタイカ レンゾク ナガレ ホウシキ カガク ハッコウホウ ニ ヨル ス
  • 誘導体化-連続流れ方式・化学発光法による水中ホルムアルデヒドの定量

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Abstract

Formaldehyde (HCHO) is an important species in atmospheric chemistry. In order to determine the HCHO content in a water sample by chemiluminescence (CL), HCHO is converted into a fluorescent derivative through a reaction with 4-amino-3-penten-2-one(APO). The derivatized HCHO is determined by using a bis(2, 4, 6-trichlorophenyl)oxalate (TCPO) flow CL system. Derivatization is carried out in 4 mM APO solution(pH 5.0) at 60°C for 40 min. Acetone was found to be better solvent for TCPO than the conventionally used ethyl acetate and acetonitrile, probably due to its high miscibility with aqueous sample solutions. The derivatized sample solution is mixed with 0.6 mM TCPO acetone solution and 0.03 M H2O2 (in 20% acetone). The flow rates of derivatized sample, TCPO and H2O2 solutions were 0.2, 0.5 and 1.3 ml min -1, respectively.The detection limit (S/N= 3) was 9.3 ng ml -1 and the CL intensity was proportional to HCHO concentration up to 70 μg ml -1. Contaminant ions usually found in rainwater did not interfere with the determination. While higher aldehydes were not derivatized under the reaction conditions, they gave a small negative error to the measurement.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 42 (8), 439-443, 1993

    The Japan Society for Analytical Chemistry

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