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用Ta涂层的热解石墨管进行分析，用硝酸镍作为基体改进剂，可使灰化温度高达1300℃，消除基体和抗干扰能力强。方法的绝对灵敏度为11Pg、检出限（2σ）为2．57ng。实际样品的回收率为96．2％～102．2％。
Analysis of Ta-coated pyrolytic graphite tubes with nickel nitrate as a matrix modifier can result in an ashing temperature of up to 1300 ° C, eliminating matrix and high resistance to interference. The absolute sensitivity of the method was 11 Pg and the limit of detection (2σ) was 2.57 ng. The actual sample recovery was 96.2% ~ 102.2%.