纯碱指　标　项　目    标　准　指　标
                                                              Ⅱ类优等      Ⅱ类一等
总碱量（以干基的Na2CO3的质量分数计）/%≥    99.2          98.8    
总碱量（以湿基的Na2CO3质量分数计）/%≥    97.9      97.5    
氯化钠（以干基的NaCl的质量分数计）/%≤    0.70        0.90    
铁（Fe）的质量分数（干基计）/%≤指    0.0035    0.0060    
硫酸盐（以干基的SO4的质量分数计）/%≤0.03    0.03            
水不溶物的质量分数计/%≤      0.03      0.01
堆积密度（g/ml）≥                        0.90      0.90    
粒度筛余物
（％）    80目≥                                      70.0      65.0    
    20目≤    2.0                  
    150目≥／≤    90／5                  
    16目≤    5