A Highly Sensitive and Selective Colorimetric Hg²⁺ Ion Probe Using Gold Nanoparticles Functionalized with Polyethyleneimine

Table 2

Analytical results for the detection of Hg²⁺ in real citrus leaf samples.

This method					DMA
Samples	Average value (nM)	Recovery (%)	RSD (%)	Accuracy (%)	Average value (nM)
1	22.8 ± 0.34	101.8	1.54	0.22	22.4
2	23.9 ± 0.42	98.7	1.72	1.29	24.3
3	23.1 ± 0.50	98.1	2.13	1.90	23.5

RSD: relative standard deviation.