Arsenic in bell metal

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We have just replaced the old Bilbie 8th at Redcliffe with a new Taylor bell. The old bell was out of tune with itself, as demonstrated by Bill Hibbert, but there is a story going around now that another reason it sounded bad was that there was arsenic in the bell metal. The presence of arsenic would not be unusual, as some copper ores contain arsenic, and I believe that some archealogical artifacts are made of 'arsenical bronze'. But I find it hard to believe that would affect the tuning of the bell although if there was enough to affect the internal damping I suppose it would affect the resonance, if that's the right word.
Does anyone have any experience of this in other bells?