The common light source of spectral analysis has several kinds of discharge methods:

1. 高能预火花放电最大电流可达150安和燃烧时间为150微秒，这样使试样中燃烧斑点内的组织结构更加均匀，由此来消除元素之间干扰及元素之间结合等效应。

1., the maximum current of high energy spark discharge can reach 150 and the combustion time is 150 microseconds, which makes the structure of the spots in the combustion spot more homogeneous, thereby eliminating the interference between elements and the combination of elements.

2.火花型放电对大多数元素重现性好。

2. spark discharge has good reproducibility to most elements.

3. 电弧型放电重现性要比火花放电差2—3倍，但对痕量元素检出限要低得多。

The reproducibility of 3. arc discharge is 2 to 3 times less than that of spark discharge, but the detection limit for trace elements is much lower.