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研究六四式手枪射击残留物中NO_2~-含量与射击后时间的相关性,为枪支射击时间的推测提供依据。六四式手枪射击后,采用超纯水对枪支无损淋洗提取,分别在射击后4h、8h、12h、24h、36h、48h、72h提取枪管中射击残留物,通过紫外-可见分光光度计测定射击残留物中NO_2~-含量。NO_2~-在浓度1×10~(-6)mol/L至1×10~(-5)mol/L以内,NO_2~-与吸光度的线性关系良好,回收率在98%~102%之间。射击残留物中NO_2~-含量与射击时间呈对数关系,枪支在射击72h后仍可检出NO_2~-。
To study the correlation between the content of NO 2 - in pistol shooting residues and the time after shooting, and to provide the basis for the speculation of the shooting time of firearms. After the June 4 type pistol was shot, the non-destructive leaching of the firearms was carried out by using ultrapure water. The shot residues in the barrel were taken at 4h, 8h, 12h, 24h, 36h, 48h and 72h after shooting respectively and were analyzed by ultraviolet- visible spectrophotometer Determination of NO2 ~ - in shoot remnants. NO 2 ~ - within the concentration of 1 × 10 -6 mol / L to 1 × 10 -5 mol / L or less, NO 2 ~ - has a good linear relationship with the absorbance, the recovery rate was between 98% ~ 102% . The content of NO_2 ~ - in shoot remnant showed a logarithmic relationship with the shooting time, and the NO_2 ~ - could still be detected after 72 h shooting.