an a toni hi ng contamination, mon t e hi he t ever recorded," Dr. P ul John ton, n qu tic to icolo i t at 0 een ry Colle e in London, quoted a ayin in Greenpe t tement. JOn TO QUOTED by the Gu rdi n a ying the mercury con­ t min lion "exten ive nd erlous," and th t level ere hundred of time bove the orld Health Or nization' m ximum c­ cept ble level for. drinking ater. The aZulu homel nd in the ourhe tern part of South frica i home to 7 million BI ck . South fric i the only n tion that recognize the re a inde­ pendent. Greenpe ce id the toxic ie h been introduced into the ter upply hen heavy r in c rry con­ t min ted oil into the river. Chi Prie tley, a poke­ man for Thor Chemical, c­ cu ed Greenpeace of "en tiona Ii m." He said if hi comp ny con- , t min ting ater, high mer­ cury level ould lobe pre ent in drin ing ater in Durban, about 50 mile do n tream. Prie tley id the high le el of mercury in the oil mple a due to form old minin c lied mer­ le ching , u ed in poi o nearby mine ago. fe year HE 10 exce mercury e ped into the river from the ab ndoned mine, nd contaminated the nearby Zul u are , but not Durba which i too far down tream for the contamination to f­ feet. "I h ve no evidence that lead me to believe that any coruamin tion that i arising i coming form Thor Chemi­ c I itself. We mu t no in­ ve tigate and find out hy this i happening," Prie tley said. In the Itt 0 ye rs, the gro ing trade in hazar�ous te h prompted a num- ber of greements on dump­ ing in Africa. In December 1989, the European Com­ munity igned a w te trade b n with 68 Afric n, C rib­ be n and pacific st te . In M y 1988 nd July 1989, the Organization of African Unity dopted re olution c Iling for a toxic re import ban for Afric . South Africa i banned from member hip in the e gro up due to the government' pr ctice of r ci I di crimination. munity.