例1测定含铁样品中w(Fe),比较结果的准确度。 A.铁矿中, T=62.38%,x=62.32% E=x-T=-0.06 B.Li2CO3试样中,T=0.042%,x=0044% E=x-T=00020 E E 100%-0.06/6238=-0.1% B E 100%=0.002/0.042=5%5 a 62.38%, 62.32% 0.06% T x E x T = = = − = − 例1 测定含铁样品中w(Fe), 比较结果的准确度。 A. 铁矿中， B. Li2CO3试样中, A. B. a r a r 100% －0.06 / 62.38 0.1 100% 0.002 / 0.042 5% E % E T E T E =  = = =  = = − a 0.042%, 0.044% 0.002% T x E x T = = = − =