AN APPROACH ON THE METHOD OF DETERMINATION OF POTASSIUM FEROCYANIDE IN EDIBLE SALT
Disputes always exist on the determination of potassium ferrocyanide in solar salt and no suitable solution has been found. We all know that no potassium ferrocyanide is added as anti-caking agent during the production process of solar salt and no potassium ferrocyanide is produced from the raw sea water and its production process. However, 1～4mg/kg of potassium ferrocyanide is detected as per the standard determination method. Such a result complies with the requirement specified in the State Standard <Edible Salt>. But problems will occur when products pickled with such salt are marked with no detected potassium ferrocyanid for export or are to be applied for green food. The users use solar salt for pickling purpose while no addition of potassium ferrocyanide is verified with the determination report by the legal testing organ. The result of determination shows the existence of potassium ferrocyanide due to the problem of determination method. Why does this result happen?The relevant testing organs are ceaselessly looking for the solution. China National Sea Salt and Lake Salt Standardization Center and China National Well and Rock Salt Standardization Center revised the standard for determination of potassium ferrocyanide in the year of 2003. Pyridine-pyrazolone method is included in the standard for the detection of potassium ferrocyanide in edible salt and the determination of trace potassium ferrocyanide. Since then, several determinations have been conducted with pyridine-pyrazolone method by our Center with no potassium ferrocyanide detected. However, the actual operation of this method is too complicated with more reagents, longer time and higher cost. The former ferrous sulfate method is easier, quicker and less costing. The fact is that the determination of potassium ferrocyanide in edible salt conducted in other industries rather than salt industry is ferrous sulfate method.
Lou Yuzhi
Product Quality Testing Center under Zhejiang Provincial Salt Administration
国际会议
9th International Symposium on Salt(第九届世界盐业大会)
北京
英文
1382-1384
2009-09-05（万方平台首次上网日期，不代表论文的发表时间）