The nitrate concentration of domestic vegetables on Helsinki market in summer and autumn 1984

Abstract

Abstract. Nitrate concentration of some domestic vegetables at Helsinki district market was studied during the summer and autumn months of the year 1984. The species were cabbage (Brassica oleracea var capitata), Chinese cabbage ( Brassica pekinensis) , kohlrabi (Brassica oleracea var gongylodes), turnip ( Brassica rapa), carrot (Daucus Carola subsp. salivas) and crisphead and butter head lettuce (Lactuca saliva var. capitata). The 395 samples were analysed with an ion specific electrode.There was a wide range of nitrate concentrations within each species. The mean concentrations mg nitrates/kg of fresh weight were the following: butter head lettuce 1835, Chinese cabbage 1057, kohlrabi 1008, crisphead lettuce 964, turnip 908, cabbage 607 and carrot 264. The nitrate concentration of butter head lettuce in the autumn was more than twice as high as that in the summer, and vice versa as tocabbage samples. The nitrate concentration of carrot samples in the summer was about 40 % higher than in the autumn.

Effect of cooking on nitrate in dehydrated soups

“…The large differences reflect the wide variety of products analyzed. They are consistent with the levels expected from the nitrate contents of the vegetables used as ingredients (Siciliano et al, 1975;Garcia-Rocht & Ilnitski, 1986;Ahonen et al, 1987). The highest levels of nitrate were found in those soups containing spinach, which in common with celery, red-beet, and Swiss chard, can store relatively large quantities of nitrate.…”

Nitrate and nitrite content in organically cultivated vegetables

“…Conversely, Nilsson (1979) found higher nitrate levels in organic cabbages than in those fertilized with soluble NPK, whereas Ahonen et al (1987) and Stopes et al (1988) did not obtain significant differences between conventional and organic cabbages.…”

“…Data source Organic Conventional Conventional Siciliano et al (1975) 784 0.5 Nilsson (1979) 171 84 Causeret (1984) 159.5 (2.5 -791.3)* 1.1 (0.1 -10.1) Garcı´a-Roche´and Ilnitsky (1986) 407.9 (143.5 -932.9) 0.6 (0.0 -2.4) Ahonen et al (1987) 393.8 422.0 Schuster and Lee (1987) 671.6 Non-detected Lakhidov et al (1994) 666.7 -918.74 Wieczorek and Traczyk (1995) 177.2 Non-detected Rutkowska (1997) 728.4 Santamaria et al (1999) 400 (8 -929) Souci et al (1999) 1070.0 (10.0 -3230.0) Amr and Hadidi (2001) 34.0 (1.3 -53.7) 1.0 (Non-detected -2.6) Elmadfa (2001) 740 1070 Yordanov et al (2001) 196.9 1.02 Ximenes et al (2000) 1829.0 Zhong et al (2002) 1530 Tamme et al (2006) 437 (74 -1138) Non-detected Susin et al (2006) 881 (112 -1864) 0.2 (Non-detected -0.4) Note: *Mean (range). Table 6.…”

Nitrate and nitrite in vegetables from areas affected by war-time operations in Croatia

“…Nitrate contents in cabbage ranging from 117 -1 680 mg NaNO 3 /kg FW (mean 911 mg) were somewhat higher than those in other countries [2,8,16,17], although Meah et al [4] found that, due to seasonal variations, the nitrate contents in cabbage ranged from 40 -2 800 mg NaNO 3 /kg FW with mean values from 150 mg NaNO 3 /kg FW in March to 1600 mg NaNO 3 /kg FW in July.…”