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1、硅铁中硅的测定（比重法）I 方法要点：硅铁中硅的比重较小（2.329）,而铁的比重较大（7.87）,二者相差较 多，故在水中能很明显地表现出来，根据比重的不同换算成硅的百分 含量。II .分析方法：开药物天平上称取经捣碎之硅铁 100克（此试样须经60目孔筛筛过 （大于60目孔及小于60目孔的都不要），置于100毫升之干燥细口 容量瓶中，从滴定管中注入蒸馏水至量瓶上的刻度处，记下滴定耗用蒸馏水体积。计算： 100克硅铁体积=100-耗用蒸馏水体积 查阅下表，即得硅铁含量。比重法（体积）测定硅铁中含硅量的换算表100克硅铁体积硅%100克硅铁体积硅%100克硅铁体积硅%14.518.015.92
2、8.817.336.814.619.016.029.517.437.214.720.016.130.217.537.614.821.016.230.917.638.014.921.816.331.617.738.415.022.516.432.317.838.815.123.216.533.017.939.215.223.916.633.718.039.615.324.616.734.418.140.015.425.316.834.818.240.315.526.016.935.218.340.615.626.717.035.618.440.915.727.417.136.018.541.21
3、5.828.117.236.418.641.5100克硅铁体积硅%100克硅铁体积硅%100克硅铁体积硅%18.741.822.954.727.164.418.842.123.054.927.264.618.942.423.155.227.364.819.042.723.255.527.465.019.143.023.355.727.565.219.243.523.456.027.665.519.343.923.556.327.765.719.444.223.656.627.865.919.544.623.756.927.966.119.645.023.857.228.066.319.745.
4、323.957.528.166.519.845.624.057.828.266.719.945.924.158.028.366.920.046.224.258.228.467.120.146.524.358.428.567.320.246.824.458.628.667.520.347.224.558.828.767.720.447.524.659.028.867.920.547.824.759.228.968.120.648.124.859.429.068.320.748.424.959.629.168.520.848.725.059.8”9.268.720.949.025.160.029.
5、368.921.049.325.260.229.469.121.149.625.360.429.569.321.25025.460.629.669.521.350.325.560. 829.769.821.450.625.661.0”9.870.021.550.925.761.329.970.221.651.225.861.630.070.421.751.525.961.830.170.621.851.826.062.030.270.821.952.126.162.230.371.022.052.426.262.530.471.222.152.626.362.730.571.422.252.9
6、26.463.030.671.622.353.226.563.230.771.822.453.526.663.430.872.022.553.826.763.630.972.322.654.026.863.831.072.622.754.226.964.031.172.822.854.527.064.231.273.0100克硅铁体积硅%100克硅铁体积硅%100克硅铁体积硅%31.373.235.282.139.190.631.473.435.382.339.290.831.573.635.482.539.391.031.673.835.582.839.491.231.773.935.683
7、.039.591.431.874.035.783.239.691.631.974.235.883.439.791.832.074.435.983.639.892.032.174.636.083.839. 992.232.274.836.184.040.092.432.375.136.284.240.192.732.475.436.384.440.293.032.575.736.484.640.393.332.675.936.584.840.493.632.776.236.685.040.593.932.876.536.785.240.694.232.976.736.885.440.794.53
8、3.076.936.985.640.894.733.177.237.085.840.994.933.277.537.186.041.095.133.377.737.286.241.195.333.477.937.386.441.295.533.578.137.486.641.395.833.678.337.586.841.496.033.778.637.687.141.596.233.878.937.787.341.696.433.979.237.887.641.796.834.079.537.987.941.896.834.179.738.088.141.997.134.280.038.18
9、8.242.097.434.380.238.288.4r 42.197.734.480.538.388.742.298.034.580.738.488.842.398.334.680.938.589.142.498.534.781.138.689.442.598.834.881.338.789.642.699.134.981.538.889.942.799.435.081.738.990.142.899.635.181.939.090.342.999.8m .讨论:1从滴定管中注入蒸馏水于量瓶时， 要不断摇荡瓶中硅铁，以免其中夹带的气体不能排出影响体积 2 蒸馏水水加完后，应立即读数，不要停留时间过长，困为硅铁在水 中会产生气体，使液面升高，影响体积。3 根据硅铁含量换算表也可以划成工曲线，这样查阅更为方便。
