Analysis of Leafy Vegetable Nitrate Using a Modified Spectrometric Method

Table 3

Results from stability tests and spike analyses.

Vegetable	Stability test		Spike analysis
	N	CV (%)	Concentration without spiking (μg/g)	Recovery rate (%)
Bok coy	5	5.55	1490	74.8
Cabbage	5	5.33	821	75.0
Celery	5	2.40	2287	86.0
Chinese cabbage	5	1.39	1287	84.1
Chinese kale	5	3.26	607	78.0
Lettuce	5	5.49	298	89.0
Mustard green	5	2.40	2469	83.3
Pak choi	5	2.04	3057	91.4
Water spinach	5	4.42	2087	91.4
Mean±SD		3.59±1.63	1600±934	83.7±6.52

CV = coefficient of variation; SD = standard deviation.