主题：【求助】(还剩第一篇）麻烦大家帮忙找几篇文献

1、A phenol-hypochlorite manual determination of ammonium-nitrogen in Kjeldahl digests of    plant tissue
  http://www.informaworld.com/index/905358390.pdf
2、Sensitive and Selective Spectrophotometric Determination of Para- and Ortho- Aminophenol    with Hypochlorite-Alkaline Phenol (Berthelot) Reagents
  http://www.informaworld.com/index/762518427.pdf
3、Application of the Berthelot reaction to the determination of ammonium-N in soil extracts    and soil digests
  http://www.informaworld.com/index/905348766.pdf
4、Kinetic study of Berthelot reaction steps in the absence and presence of coupling          reagents
  http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6THP-448YNC3-      57&_user=1021790&_coverDate=02%2F28%2F1989&_alid=841825835&_rdoc=60&_fmt=high&_orig=search&_cdi=5288&_sort=d&_docanchor=&view=c&_ct=89&_acct=C000050480&_version=1&_urlVersion=0&_userid=1021790&md5=65cea9e38b608adbac2aa77a79349dd4