Highly sensitive solid-phase colorimetry for nickel ion was demonstrated using an improved reflection colorimeter equipped with a coaxial optical-fiber cable. The nickel complex with α-furil dioxime was collected on a small-size membrane filter embedded in a disposable syringe filter unit. The leading edge of the optical-fiber cable was connected to the syringe filter unit via a Luer-lock fitting, and the color intensity of the sample on the filter was evaluated accurately. The detection limit was 0.8 ng in 2.5 mL of the complex solution (0.3 μg L⁻¹). This improved configuration is applicable to highly sensitive on-site analysis without expensive instruments nor high laboratory skills.

使用配备同轴光纤电缆的改进反射色度计证明了镍离子的高灵敏度固相色度法。镍与 α-呋喃二肟的配合物被收集在嵌入一次性注射器过滤器单元的小尺寸膜过滤器上。光纤电缆的前缘通过鲁尔锁接头连接到注射器过滤器单元，并准确评估过滤器上样品的颜色强度。在 2.5 mL 复合溶液（0.3 μg L ^-1）中的检测限为 0.8 ng 。这种改进的配置适用于高灵敏度的现场分析，无需昂贵的仪器和高水平的实验室技能。