硫在自然界分布广,存在形式复杂,故有关硫测定的报导极多,专著也不少。但因受各种实情如试样的法质、含量、精度要求等限制,使用面较广的微量硫测定方法则不多。特别是需要较准确地测定微克量或更低(相对浓度ppm或更低)的硫时,几乎都是使用特定条件下的特定方法。欲求广用之法,即需要一种灵敏度高、选择性好,测定某一普通形式硫的方法,还需一种能将其他形式硫转化为这类形式硫的手段。文献中报道,目前各国使用较普遍的是转化成SO_4~(2-)后进 Sulfur is widely distributed in nature and exists in complicated forms. Therefore, there are many reports on sulfur determination and many monographs. However, due to various facts such as the quality of the sample, content, accuracy requirements and other restrictions, the use of a wide range of micro-sulfur determination method is not much. In particular, when it is necessary to accurately measure micrograms of grams or less of sulfur (relative concentration of ppm or less), almost all of the specific methods under the specific conditions are used. The desire for a broad-based approach calls for a method of high sensitivity, good selectivity and determination of a common form of sulfur, as well as a means of converting other forms of sulfur into such forms of sulfur. Literature reports, the current use of the more common in all countries into the SO_4 ~ (2-) backward