Table 5.

Precision parameters obtained through ordinary least square (OLS) regression for W(VI) using one or different ALP modified SPCEs under optimum conditions on Table 1.

Reproducibility			Repeatability
Electrode	Slope A/M	R2	Electrode 3 Slope A/M	R2
1	0.0629	0.9974	0.0609	0.9902
2	0.0568	0.9966	0.0537	0.9932
3	0.0609	0.9906	0.0507	0.9930
Media	0.0595		0.0551
Std. Dev.	0.0025		0.0052
RSD%	4.2		9.4