载体沉淀分离富集-二甲酚橙光度法测定氧化锌中微量铅

doi:10.19964/j.issn.1006-4990.2024-0568

Abstract

Abstract:

Considering the complex instrumentation and high operator requirements required for the determination of trace lead in zinc oxide produced by direct methods，a simple carrier coprecipitation pre-concentration-xylenol orange spectrophotometric method was proposed.By using strontium chloride as a carrier to precipitate and separate lead in sulfuric acid medium，then converting lead sulfate into lead carbonate with potassium carbonate，dissolving lead carbonate into lead ions with nitric acid and finally forming a purple red complex with xylenol orange，a spectrophotometric method for the determination of trace lead was established.The effects of solution pH，the concentration of chromogenic reagents and the interfering ions on the method were investigated.The results showed that the absorbance value of the generated complex was changed linearly with the concentration of lead ions.The linear concentration range was 1.45~14.49 μmol/L，the linear equation was ΔA=0.059 24c -0.017 15，and the correlation coefficient R² was 0.990 3.The relative deviation between the measured values of lead in direct zinc oxide obtained by this method and those obtained by atomic absorption spectroscopy was between -1.7% and -1.2%.Compared with the atomic absorption spectroscopy method specified in the current standard GB/T 4372.2—2014 “Direct method for chemical analysis of zinc oxide part 2：Determination of lead oxide content”，this method had the advantages of simple instrument and easy operation，and could be used for industrial promotion.

Key words: zinc oxide, carrier precipitation, lead, xylenol orange, spectrophotometric method

CLC Number:

TQ132.4

WANG Huiying, ZHOU Juan, ZHANG Tao, ZHU Yiwen, JIANG Mingyue, CHEN Dinglong, CI Lijie. Determination of trace lead in zinc oxide through carrier coprecipitation pre- concentration-xylenol orange spectrophotometric method[J]. Inorganic Chemicals Industry, 2025, 57(6): 108-113.

Figures/Tables 7

Table 1

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References 20

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步骤	温度/℃	升温速率/ （℃·s^-1）	保持时间/ s
干燥1	80	6	20
干燥2	90	3	20
干燥3	110	5	10
灰化1	350	50	20
灰化2	800	300	10
原子化	1 500	1 400	4
除残	2 450	500	4

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Determination of trace lead in zinc oxide through carrier coprecipitation pre- concentration-xylenol orange spectrophotometric method

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