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j <br /> Where: <br /> A = First-order decay constant(years'); equals 0.6931ttn, where t1j2 is the half-life in years; � <br /> Ct2 = TBA concentration at time t2, in Ng/L; <br /> Ctt = TBA concentration at time t1„ in pg/L; <br /> t = Time between t1 and U. <br /> I <br /> I <br /> I <br /> i <br /> 17 <br /> I <br /> i <br />