中国地质学会岩矿测试技术专业委员会、国家地质实验测试中心主办

一阶导数分光光度法同时测定水样中Cr(Ⅲ)和Cr(Ⅵ)

徐红纳, 靳立国, 由丽梅, 程艳. 一阶导数分光光度法同时测定水样中Cr(Ⅲ)和Cr(Ⅵ)[J]. 岩矿测试, 2020, 39(5): 785-792. doi: 10.15898/j.cnki.11-2131/td.201908090118
引用本文: 徐红纳, 靳立国, 由丽梅, 程艳. 一阶导数分光光度法同时测定水样中Cr(Ⅲ)和Cr(Ⅵ)[J]. 岩矿测试, 2020, 39(5): 785-792. doi: 10.15898/j.cnki.11-2131/td.201908090118
Hong-na XU, Li-guo JIN, Li-mei YOU, Yan CHENG. Simultaneous Determination of Chromium(Ⅲ) and Chromium(Ⅵ) in Water by the First Derivative Spectrophotometric Method[J]. Rock and Mineral Analysis, 2020, 39(5): 785-792. doi: 10.15898/j.cnki.11-2131/td.201908090118
Citation: Hong-na XU, Li-guo JIN, Li-mei YOU, Yan CHENG. Simultaneous Determination of Chromium(Ⅲ) and Chromium(Ⅵ) in Water by the First Derivative Spectrophotometric Method[J]. Rock and Mineral Analysis, 2020, 39(5): 785-792. doi: 10.15898/j.cnki.11-2131/td.201908090118

一阶导数分光光度法同时测定水样中Cr(Ⅲ)和Cr(Ⅵ)

  • 基金项目:
    2019年度黑龙江省省属高等学校基本科研业务费科研项目(2019-KYYWFMY-0055)
详细信息
    作者简介: 徐红纳, 硕士, 讲师, 主要从事分析化学研究。E-mail:13838782@163.com
    通讯作者: 靳立国, 硕士, 高级工程师, 主要从事矿产地质分析测试工作。E-mail:yaoguo97@163.com
  • 中图分类号: O614.242;O657.31

Simultaneous Determination of Chromium(Ⅲ) and Chromium(Ⅵ) in Water by the First Derivative Spectrophotometric Method

More Information
  • 环境水样中的铬通常以Cr(Ⅲ)和Cr(Ⅵ)的形态存在,不同价态的铬产生不同的生理作用,对不同价态铬进行准确分析是必要的。目前Cr(Ⅲ)和Cr(Ⅵ)的测定方法大多数是先分离后再测定,或先测定出Cr(Ⅲ)或Cr(Ⅵ),然后通过氧化或还原测定铬的总量,再差减法计算出另一价态铬的含量,此操作复杂,并且在处理过程中易导致价态的改变,误差较大,精确度难以保证。本文用一阶导数分光光度法消除了Cr(Ⅲ)对Cr(Ⅵ)干扰,能同时测定Cr(Ⅲ)或Cr(Ⅵ)的含量。混合水样中加入显色剂EDTA-2Na,调节溶液pH在3~3.5,恒温水浴70℃条件保持加热15min,测定吸光度,导数间隔因子为10nm求一阶导数,在波长330nm处Cr(Ⅵ)吸光度一阶导数有最大值,而在此波长处Cr(Ⅲ)-EDTA络合物吸光度一阶导数值为0,可用一阶导数分光光度法测定Cr(Ⅵ)的含量,在Cr(Ⅲ)-EDTA的最大吸收波长543nm处测溶液吸光度,直接测定Cr(Ⅲ)的含量。在优化实验条件下,Cr(Ⅲ)线性回归方程为A=0.0036ρ-0.0002(r2=0.9999),线性范围为0~120mg/L,检出限为0.006mg/L;Cr(Ⅵ)线性回归方程为D=0.00072ρ-0.00013(D为一阶导数值,r2=0.9996),线性范围为0~100mg/L,检出限为0.005mg/L。Cr(Ⅲ)和Cr(Ⅵ)加标回收率为97.8%~102.6%。该方法能够满足废水中Cr(Ⅲ)和Cr(Ⅵ)分析测试要求。
  • 加载中
  • 图 1  Cr(Ⅵ)和Cr(Ⅲ)-EDTA络合物的(a)吸收光谱图和(b)一阶导数光谱图

    Figure 1. 

    图 2  导数间隔因子的确定

    Figure 2. 

    图 3  溶液pH值对Cr(Ⅵ)和Cr(Ⅲ)-EDTA络合物吸光度的影响

    Figure 3. 

    图 4  EDTA-2Na加入量对Cr(Ⅲ)吸光度的影响

    Figure 4. 

    表 1  反应时间及温度对Cr(Ⅲ)吸光度的影响

    Table 1.  Effect of reaction time and temperature on the absorbance of Cr(Ⅲ)

    反应温度
    (℃)
    吸光度
    5min 10min 15min 20min 25min 30min
    40 0.0104 0.0384 0.0489 0.0567 0.0611 0.0643
    50 0.0452 0.0582 0.0682 0.0687 0.0701 0.0758
    60 0.0730 0.0758 0.0772 0.0784 0.0786 0.0795
    70 0.0756 0.0779 0.0780 0.0783 0.0791 0.0796
    80 0.0751 0.0781 0.0791 0.0802 0.0805 0.0806
    下载: 导出CSV

    表 2  干扰离子对Cr(Ⅲ)和Cr(Ⅵ)测定的影响

    Table 2.  Effect of interferencing ions on the determination of Cr(Ⅲ) and Cr(Ⅵ)

    干扰物质 干扰物质浓度(mg/L) 混合溶液浓度(mg/L) Cr(Ⅲ)测得量(mg/L) Cr(Ⅵ)测得量(mg/L) 相对误差(%)
    Cr(Ⅲ) Cr(Ⅵ) Cr(Ⅲ) Cr(Ⅵ)
    Mg2+ 800 4.0 4.0 5.57 4.00 39.3 0
    500 4.0 4.0 4.16 4.14 4.0 3.5
    Al3+ 200 4.0 4.0 4.96 4.14 24.0 3.5
    100 4.0 4.0 4.08 3.98 2.0 0.5
    Cu2+ 100 4.0 4.0 4.32 4.40 8.0 10
    50 4.0 4.0 4.20 4.16 5.0 4.0
    Co3+ 200 4.0 4.0 4.78 4.16 19.5 4.0
    100 4.0 4.0 4.06 4.02 1.5 0.5
    Pb2+ 200 4.0 4.0 4.55 4.14 13.8 3.5
    100 4.0 4.0 4.06 4.12 1.5 3.0
    Ni2+ 100 4.0 4.0 5.26 4.28 31.5 7.0
    50 4.0 4.0 4.13 4.12 3.2 3.0
    Fe3+ 40 4 4 4.63 4.80 15.8 20
    20 4 4 4.15 4.16 3.8 4.0
    下载: 导出CSV

    表 3  样品中Cr(Ⅲ)和Cr(Ⅵ)的测定结果及加标回收率

    Table 3.  Analytical results and spiked recovery of Cr(Ⅲ) and Cr(Ⅵ) in samples

    实际样品 铬形态 测定值
    (mg/L)
    加标量
    (mg/L)
    总回收量
    (mg/L)
    回收率
    (%)
    电镀废液 Cr(Ⅲ)
    Cr(Ⅵ)
    5.05
    8.89
    5.0
    5.0
    9.91
    13.96
    98.2
    101.4
    废铬酸洗液 Cr(Ⅲ) 16.07 5.0 21.20 102.6
    Cr(Ⅵ) 9.14 5.0 14.03 97.8
    下载: 导出CSV
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出版历程
收稿日期:  2019-08-09
修回日期:  2019-12-11
录用日期:  2020-04-16

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