Table 1.

Combinations of the major geochemical salts and mannitol tested in binary toxicity experiments. Letters denote groups of experiments – “A” for salts with same cation, “B” for Na/Mg salts, “C” for Ca/Na salts, “D” for Ca/Mg salts, “E” for KCl with other chloride salts, and “F” for mannitol with chloride salts. “Ca” denotes combination also tested at elevated Ca. Shaded blocks denote untested chemical pairs.

	NaCl	Na2SO4	NaHCO3	MgCl2	MgSO4	MgCO3	CaCl2	CaSO4
Na2SO4	A,Ca
NaHCO3	A	A
MgCl2	B,Ca
MgSO4	B	B,Ca		A,Ca
MgCO3	B		B	A	A
CaCl2	C	C		D	D
CaSO4	C			D			A
KCl	E			E			E
Mannitol	F			F			F