propos intern commiss protect rhine pollut intend supplement annex iv convent protect rhine chemic pollut sign bonn decemb intern commiss protect rhine pollut regard convent protect rhine chemic pollut sign bonn decemb regard articl thereof propos contract parti convent annex iv convent supplement respect carbon tetrachlorid gt pic file quot quot gt limit valu industri sector establish carbon tetrachlorid solvent propos intern commiss stage meantim govern fix emiss standard carbon tetrachlorid autonom accord articl convent standard account technic mean stringent nearest compar limit annex iv provis paragraph appli industri establish engag activ limit valu laid tabl produc discharg carbon tetrachlorid pursuant articl convent provis enter forc unanim adopt contract parti convent contract parti notifi adopt govern swiss confeder acknowledg receipt notif