Gibson R S, Anderson B M, Scythes C A
Am J Clin Nutr. 1983 Jan;37(1):37-42. doi: 10.1093/ajcn/37.1.37.
Hair Zn, Cu, and Mn concentrations were determined by neutron activation procedures in two groups of healthy, Caucasian children aged 4.5 to 5.5 yr from Halifax, Nova Scotia and Guelph, Ontario and consuming soft water (hardness - 33 ppm) and very hard tap water (hardness = 330 ppm), respectively. Median hair Zn level for the Halifax children (26 males and 26 females) was 140 microgram/g, significantly higher (p less than 0.001) than the Guelph children (median = 82 microgram/g; 25 males and 26 females). No significant differences existed between the two groups for median hair Cu and Mn levels (Halifax hair Cu 12.1 microgram/g. Guelph hair Cu 11.0 microgram/g. Halifax hair Mn 0.17 microgram/g. Guelph hair Mn 0.18 microgram/g). The Halifax children were significantly heavier (p less than 0.001) and slightly taller (p = 0.09) than their Guelph counterparts, although mean daily intakes of energy, protein, Zn, Cu, Mn, and dietary fiber, calculated from 3-day food records were not significantly different in the two groups. The large differences in the hair zinc levels may be due to the high concentration of calcium in the Guelph hard water, which may decrease the absorption of zinc.
通过中子活化程序测定了两组健康的白种儿童头发中的锌、铜和锰含量。这两组儿童年龄在4.5至5.5岁之间，分别来自新斯科舍省哈利法克斯和安大略省圭尔夫，分别饮用软水（硬度 - 33 ppm）和极硬的自来水（硬度 = 330 ppm）。哈利法克斯儿童（26名男性和26名女性）的头发锌含量中位数为140微克/克，显著高于圭尔夫儿童（中位数 = 82微克/克；25名男性和26名女性）（p < 0.001）。两组儿童头发铜和锰含量的中位数没有显著差异（哈利法克斯头发铜12.1微克/克，圭尔夫头发铜11.0微克/克，哈利法克斯头发锰0.17微克/克，圭尔夫头发锰0.18微克/克）。哈利法克斯儿童比圭尔夫儿童明显更重（p < 0.001）且略高（p = 0.09），尽管根据3天食物记录计算的两组儿童能量、蛋白质、锌、铜、锰和膳食纤维的平均每日摄入量没有显著差异。两组儿童头发锌含量的巨大差异可能是由于圭尔夫硬水中钙的浓度较高，这可能会降低锌的吸收。
