This continuum of color determines the gems value with deepest blues being the most cherished . the finest aquamarine stones come from brazil , but other important sources include afghanistan , india , madagascar , nigeria , pakistan and russia . the largest aquamarine gemstone found to date weighed 243 . 1 lbs 绿柱石是一种含铍铝的硅酸盐，海蓝宝石的颜色为天蓝色至海蓝色或带绿的蓝色的绿柱石，它的颜色形成主要是由于含微量的二价铁离子fe2 ，以明洁无暇浓艳的艳蓝至淡蓝色者为最佳。
In addition , we use spectrophotometric to study the compositions of nickel - iron alloy prepared by electrodeposition , and the main results are as follows : iron ( ) forms a stable deep purple complex with ethylenediaminetetraacetic acid disodium salt ( edta ) and hydrogen peroxide in aqueous solution at ph = 10 . 7 - 11 . 3 ; nickel ( ) forms a red complex with dlacetyl dioxime in aqueous ammonia when an oxidation ( iodine ) exists ; thus the amount of iron ( ) and nickel ( ) can be determinated by the absorption of their complexes at 519nm and 538nm respectively 利用三价铁与edta和h2o2形成稳定的深紫色三元络合物，在氨性溶液中，当有氧化剂存在时，镍与丁二酮肟形成酒红色的络合物，用吸收光度法可分别在519nm和538nm波长处测定铁、镍的含量， fe和ni的相对标准偏差分别为0 . 95和1 . 2 ；对实际样品的测定结果与xps分析一致。
Deferrizers and demaganizers are series of products designed by our company for underground water with comparatively high iron and managanese content according to aerating oxidation priciple . in these prducts , packed natural manganese sand in filter is applied as filtering materials , and oxygen in air is applied as oxidants , to make ferrous iron in water oxidized into ferric iron , in a same time , oxidation reaction makes its produced its produced substances left in filtering materials for purposes of deferrization and deman - ganization 除铁锰装置是我公司针对铁、锰较高的地下水，按曝气氧化法的原理而设计的系列产品，它是利用过滤器内装填城然锰砂为滤料，利用空气中的氧化剂，使水中的二价铁，同时发生氧化反应使其物进截留在滤料中，从而达到除，除锰的目的。
The purposes of this project were to further analyze the characteristics of their iron efficiency under iron stress , to study the physiological and molecular mechanisms of iron efficiency under iron deficiency in c . junos and m . xiaojinensis , and to analyze the spatial expression model of fcr ( ferric chelate reductase ) gene under iron stress with the hope to cast a new light on iron stress tolerance on the molecular level , to lay solid foundations for cloning fcr gene in c . junos and m . xiaojinensis , and to provide some basic data for creating new rootstocks with excellent complex characters and iron efficiency 本研究通过进一步分析香橙和小金海棠的耐缺铁特性，研究它们耐缺铁的生理原因和分子基础，并通过分析三价铁螯合物还原酶基因的空间表达模式，从分子水平上去探讨植物耐缺铁的原因，为从香橙和小金海棠中克隆三价铁螯合物还原酶基因奠定基础，并为人工创造耐缺铁的果树砧木提供基础研究数据。
The stability good , heat - resisting , the fast light , bears storing , but to oxidant sensitive , the sodium , the potassium , the calcium , the barium , the zinc , the copper and the micro hard ion pair it does not have the influence , but meets the tin to change the rose to be red , meets the lead and the abundant 2 prices iron ion , then discoloration and the precipitation 稳定性好，耐热、耐光、耐贮存，但对氧化剂敏感，钠、钾、钙、钡、锌、铜及微量铁离子对它无影响，但遇锡变玫瑰红色，遇铅及多量2价铁离子，则褪色并沉淀
