The complexation of gallium with 2-hydroxy-5-T-butylphenol-4’-methoxy-azobenzene (HR) has been studied by atomic absorption and spectrophotometric methods. The optimal conditions for the formation and extraction of t...The complexation of gallium with 2-hydroxy-5-T-butylphenol-4’-methoxy-azobenzene (HR) has been studied by atomic absorption and spectrophotometric methods. The optimal conditions for the formation and extraction of the complex were found. The maximum light absorption of the complex in n-butanol is in the range of 450 - 470 nm. The molar absorption coefficient is (3.3 - 4.2)<span style="white-space:nowrap;"><span style="white-space:nowrap;">⋅</span></span>10<sup>4</sup>. The stability constant of the gallium coordination compound in n-butanol is <em>β</em><sub>l</sub> = 4.2<span style="white-space:nowrap;"><span style="white-space:nowrap;">⋅</span></span>10<sup>10</sup>. The developed technique allows to determine the gallium content within n × 10<sup><span style="white-space:nowrap;"><span style="white-space:nowrap;">−</span></span>1</sup> - n × 10<sup><span style="white-space:nowrap;"><span style="white-space:nowrap;">−</span></span>4</sup>%. The selective and sensitive technique for the extraction-atomic absorption determination of gallium in soils has been developed.展开更多
目的建立湿法消解和火焰原子吸收光谱法检测3种大米中Ca、Fe、Mn、Cu和Zn等5种金属元素含量的方法,并评估其膳食风险。方法以云南省红河县紫米、红米和白米为实验对象,湿法消解处理大米样品,采用火焰原子吸收光谱法分别检测分析3种大米...目的建立湿法消解和火焰原子吸收光谱法检测3种大米中Ca、Fe、Mn、Cu和Zn等5种金属元素含量的方法,并评估其膳食风险。方法以云南省红河县紫米、红米和白米为实验对象,湿法消解处理大米样品,采用火焰原子吸收光谱法分别检测分析3种大米中5种金属元素含量,结合单一元素可耐受最高摄入量及靶标危害商值(target hazard quotient,THQ)进行大米膳食风险分析。结果3种大米中均检测出Ca、Fe、Mn、Cu和Zn元素;紫米和白米中各元素回收率分别在97.96%~101.45%和97.27%~102.97%之间,相对标准偏差(relative standard deviations,RSDs)值分别在1.52%~2.31%和0.42%~2.41%之间,方法可靠。结论湿法消解和火焰原子吸收法精密度好、准确度高,适用于测定3种大米中Ca、Fe、Mn、Cu和Zn元素含量,所测元素的THQ均小于1,食用3种大米均不会产生非致癌健康风险。展开更多
文摘The complexation of gallium with 2-hydroxy-5-T-butylphenol-4’-methoxy-azobenzene (HR) has been studied by atomic absorption and spectrophotometric methods. The optimal conditions for the formation and extraction of the complex were found. The maximum light absorption of the complex in n-butanol is in the range of 450 - 470 nm. The molar absorption coefficient is (3.3 - 4.2)<span style="white-space:nowrap;"><span style="white-space:nowrap;">⋅</span></span>10<sup>4</sup>. The stability constant of the gallium coordination compound in n-butanol is <em>β</em><sub>l</sub> = 4.2<span style="white-space:nowrap;"><span style="white-space:nowrap;">⋅</span></span>10<sup>10</sup>. The developed technique allows to determine the gallium content within n × 10<sup><span style="white-space:nowrap;"><span style="white-space:nowrap;">−</span></span>1</sup> - n × 10<sup><span style="white-space:nowrap;"><span style="white-space:nowrap;">−</span></span>4</sup>%. The selective and sensitive technique for the extraction-atomic absorption determination of gallium in soils has been developed.
文摘目的建立湿法消解和火焰原子吸收光谱法检测3种大米中Ca、Fe、Mn、Cu和Zn等5种金属元素含量的方法,并评估其膳食风险。方法以云南省红河县紫米、红米和白米为实验对象,湿法消解处理大米样品,采用火焰原子吸收光谱法分别检测分析3种大米中5种金属元素含量,结合单一元素可耐受最高摄入量及靶标危害商值(target hazard quotient,THQ)进行大米膳食风险分析。结果3种大米中均检测出Ca、Fe、Mn、Cu和Zn元素;紫米和白米中各元素回收率分别在97.96%~101.45%和97.27%~102.97%之间,相对标准偏差(relative standard deviations,RSDs)值分别在1.52%~2.31%和0.42%~2.41%之间,方法可靠。结论湿法消解和火焰原子吸收法精密度好、准确度高,适用于测定3种大米中Ca、Fe、Mn、Cu和Zn元素含量,所测元素的THQ均小于1,食用3种大米均不会产生非致癌健康风险。