Norwegian state oil and gas company Statoil rejected a Russian fuel oil cargo that breached hydrogen sulphide limits, a toxic gas, currently anchored in Rotterdam. The news came as shipping inspectors boarded vessels in the Amsterdam-Rotterdam-Antwerp (ARA) region to test if other cargoes were similarly contaminated. There are fears that another three cargoes from the same source might also breach hydrogen sulphide regulations. The Zoja 2, carrying 26,159 tons of fuel oil was refused permission to discharge its cargo by Rotterdam port officials on Thursday. Navitank, the seller, declined to comment on the possibility that other cargoes sold to traders and refiners might be equally polluted. "There are four cargoes from the same source, ours happens to be the first.