Analysis of Leafy Vegetable Nitrate Using a Modified Spectrometric Method

Table 4

Comparisons among analyses on spectrometry, HPLC and IC.

Method	This method on spectrometry	HPLC	IC
Cost of pre-analysis treatment material	Ion exchange SPE cartridge, NT243	Syringe filter, NT26	Ag containing SPE cartridge, NT388
Cost of instrumental analysis per sample	NT1,500	NT3,000	NT2,000
Instrumental analysis time per sample	< 1 min	15 min	15 min
Limit of detection	0.1 μg/mL	0.05 μg/mL	< 0.5 μg/mL
Availability	Nitrate only	Nitrite and nitrate	Nitrite and nitrate

[17]
[15]
Monetary values of materials are obtained from local vendors.
Analysis charges are given by the Institute of Nuclear Energy Research, Atomic Energy Council, Executive Yuan, Taiwan.