arsenate(out) + H(+)(out) => arsenate(in) + H(+)(in)
arsenate(out) + h(+)(out) => arsenate(in) + h(+)(in)
arsenate(out) + H(+)(out) => arsenate(in) + H(+)(in)
arsenate(out) + h(+)(out) => arsenate(in) + h(+)(in)