Cyanoacrylate Fuming 반응에 의한 잠재지문 현출에 미치는 몇 가지 정지물질의 영향
Influence of Some Quenching Substances on Latent Fingerprint Developing by Cyanoacrylate Fuming
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과학수사 감식현장에서 cyanoacrylate 훈증법(CA법)은 비다공성 표면 재질에 유류된 잠재지문의현출에 폭 넓게 이용되고 있으나 좋은 지문이 현출되는 정확한 시간을 택하는데 어려움이 상존하였다. 이러한 불편함을 원천적으로 해소하기 위한 대안으로 몇 가지 정지물질에 의하여 개선된 현출방법을 소개하고 신중하게 검토하였다. 그 결과로 증기압(VP)과 끊는점(BP)과의 물리화학적인 관계로부터 가장 발연성이 큰 화합물은 무기산 중 Sulfuric acid (A7), 유기산 중 Trinitrophenol (B5) 및 알콜 유도체의 Phenol(C10) 등이 각각 선택되었다. 그러나 Cyanoacrylate (CA)의 음 이온성 고분자화 반응(A-C) 중 정지제(quenching agent)로서 무수 메탄올(C1) 및 무독성 에탄올(C2)은 신속하게 전파단계(B)의 반응을 중단시키는 결과를 얻을 수 있었다.
Abstract
Cyanoacrylate fuming method (CA) is one of the most important methods used widely for thedetection of latent fingerprints deposited on the nonporous surface materials at crime scenes, but the CA methodis still in difficulty for the exact time it takes to develop good quality fingerprint. The authors introduced theimproved fingerprint detection method by using fumy acidic substances as quenching agents and discussedcarefully. The highly fumy acidic substances such as sulfuric acid (A7) in inorganic acids, trinitrophenol (B5)and phenol (C10) in organic acids, alcohol derivatives were selected from the physico-chemical relationshipbetween vapor pressures (VP) and boiling points (BP) which were tested as quenching agents to stopoverexposing the fingermark. It was found that the propagation step (B) of anionic polymerization (A-C) withcyanoacrylate (CA) monomer molecules in developing latent fingerprints should be able to be stopped quicklyusing absolute methanol (C1) and nontoxic ethanol (C2) as quenching agent.
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