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土壤干燥箱主动干燥–微波消解法测定土壤中的重金属 - 行业新闻 - 那艾

土壤干燥箱主动干燥–微波消解法测定土壤中的重金属

所属栏目:行业新闻 点击数:100 发布时间:2023-06-25
<div class="dpu8C _2kCxD " style="max-width: 100%; overflow-x: visible; font-size: 18px; line-height: 30px; color: rgb(34, 34, 34); font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="overflow-y: auto; max-width: 100%; line-height: 30px; margin-top: 0px !important; margin-bottom: 0px !important; padding: 0px !important;">利用土壤干燥箱干燥土壤、微波消解、原子吸收分光光度法,在短时间内完成大量土壤样品中重金属的测定。利用该法测定土壤中的重金属平行双样测定合格率,质控样品均能达到土壤环境监测技术规范(HJ/T166-2004)相应的要求。</p></div><div class="dpu8C _2kCxD " style="max-width: 100%; overflow-x: visible; font-size: 18px; line-height: 30px; color: rgb(34, 34, 34); margin-top: 24px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="overflow-y: auto; max-width: 100%; line-height: 30px; margin-top: 0px !important; margin-bottom: 0px !important; padding: 0px !important;">土壤污染指由于人类活动产生的有害、有毒物</p></div><div class="dpu8C _2kCxD " style="max-width: 100%; overflow-x: visible; font-size: 18px; line-height: 30px; color: rgb(34, 34, 34); margin-top: 24px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="overflow-y: auto; max-width: 100%; line-height: 30px; margin-top: 0px !important; margin-bottom: 0px !important; padding: 0px !important;">质进入土壤,积累到一定程度,超过土壤本身的目净能力,导致土壤性状和质量变化,构成对农作物</p></div><div class="dpu8C _2kCxD " style="max-width: 100%; overflow-x: visible; font-size: 18px; line-height: 30px; color: rgb(34, 34, 34); margin-top: 24px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="overflow-y: auto; max-width: 100%; line-height: 30px; margin-top: 0px !important; margin-bottom: 0px !important; padding: 0px !important;">和人体的影响和危害的现象。受到污染的土壤,本身的物理、化学性质发生改变,如土壤板结、肥力降低、土壤被毒化等;还会由于雨水淋溶,污染物从土壤传人地下水或地表水,造成水质的污染和恶化;受污染土壤上生长的生物,吸收、积累和富集</p></div><div class="dpu8C _2kCxD " style="max-width: 100%; overflow-x: visible; font-size: 18px; line-height: 30px; color: rgb(34, 34, 34); margin-top: 24px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="overflow-y: auto; max-width: 100%; line-height: 30px; margin-top: 0px !important; margin-bottom: 0px !important; padding: 0px !important;">土壤污染物后,通过食物链进入人体,可造成对人的影响和危害。其中重金属的污染具有多源性、愿秘性、长期性,污染后果严重,是重要的污染评价对象,被各国列入优先控制污染物名单&quot;。</p></div><div class="dpu8C _2kCxD " style="max-width: 100%; overflow-x: visible; font-size: 18px; line-height: 30px; color: rgb(34, 34, 34); margin-top: 24px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="overflow-y: auto; max-width: 100%; line-height: 30px; margin-top: 0px !important; margin-bottom: 0px !important; padding: 0px !important;">土壤重金属污染的防治离不开土壤质量的监测,常规的土壤监测在干燥环节采用自然风干法,费用较低,但时间较长,受交叉污染影响大,通常需要15 ~20d甚至更长时间。采用M280685新型</p></div><div class="dpu8C _2kCxD " style="max-width: 100%; overflow-x: visible; font-size: 18px; line-height: 30px; color: rgb(34, 34, 34); margin-top: 24px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="overflow-y: auto; max-width: 100%; line-height: 30px; margin-top: 0px !important; margin-bottom: 0px !important; padding: 0px !important;">土壤干燥箱干燥,应用模拟室内空气流动模式,通过外动力送风,恒定温度相结合快速进行十煤,&quot;以在ld内完成几十个样品的干燥处理工作,杆的分室独立存放和干燥,避免了样品交叉污染。</p><p style="overflow-y: auto; max-width: 100%; line-height: 30px; margin-top: 0px !important; margin-bottom: 0px !important; padding: 0px !important;"><br/></p></div><div class="dpu8C _2kCxD " style="max-width: 100%; overflow-x: visible; font-size: 18px; line-height: 30px; color: rgb(34, 34, 34); margin-top: 24px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="overflow-y: auto; max-width: 100%; line-height: 30px; margin-top: 0px !important; margin-bottom: 0px !important; padding: 0px !important;">本研究采用硝酸–氢氟酸–高氯酸的多元混酸微波消解法,使土壤分解完全,利用原子吸收分光光度仪进行测定。</p><p style="overflow-y: auto; max-width: 100%; line-height: 30px; margin-top: 0px !important; margin-bottom: 0px !important; padding: 0px !important;"><br/></p></div><div class="dpu8C _2kCxD " style="max-width: 100%; overflow-x: visible; font-size: 18px; line-height: 30px; color: rgb(34, 34, 34); margin-top: 24px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="overflow-y: auto; max-width: 100%; line-height: 30px; margin-top: 0px !important; margin-bottom: 0px !important; padding: 0px !important;">正确与否。因此必须按正确的方法采集和处理土样,以便获得符合实际的分析结果。根据土壤环境监测技术规范( HJ/T166 ~ 2004)采用梅花布点方式,对选定区域内的湿地、农田耕地等土壤表土即表土至20cm的深度土壤样品进行采集,各点取土壤的量应尽量相同,并将取到的土壤样品混合均习。1.2样品的制备及保存</p><p style="overflow-y: auto; max-width: 100%; line-height: 30px; margin-top: 0px !important; margin-bottom: 0px !important; padding: 0px !
全自动高氯COD消解仪
important;"><br/></p></div><div class="dpu8C _2kCxD " style="max-width: 100%; overflow-x: visible; font-size: 18px; line-height: 30px; color: rgb(34, 34, 34); margin-top: 24px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="overflow-y: auto; max-width: 100%; line-height: 30px; margin-top: 0px !important; margin-bottom: 0px !important; padding: 0px !important;">使用竹刀将所采集样品中的大块土壤压碎,去除碎石、植物根茎等杂物,充分混匀后放入棕色玻璃样品瓶,用封口膜封瓶,贴上标签加注,在低于4℃条件下,14d内举行前处理。剩余样品,待测定全部完成数据报出后,移交样品库保存。</p></div><div class="dpu8C _2kCxD " style="max-width: 100%; overflow-x: visible; font-size: 18px; line-height: 30px; color: rgb(34, 34, 34); margin-top: 28px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="overflow-y: auto; max-width: 100%; line-height: 30px; margin-top: 0px !important; margin-bottom: 0px !important; padding: 0px !important;">2.1.1干燥</p></div><div class="dpu8C _2kCxD " style="max-width: 100%; overflow-x: visible; font-size: 18px; line-height: 30px; color: rgb(34, 34, 34); margin-top: 24px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="overflow-y: auto; max-width: 100%; line-height: 30px; margin-top: 0px !important; margin-bottom: 0px !important; padding: 0px !important;"><span style="max-width: 100%;">去除碎石、植物根茎等杂物的土壤倒入白色瓷盘内均匀铺平,放入上海那艾</span><span style="max-width: 100%; color: rgb(0, 0, 0);">NAI-GZX-24</span><span style="max-width: 100%;">新型土壤干燥箱干燥,新型的土壤干燥箱采用模拟室内空气流动模式,即风干模式进行土壤的干燥。干燥空气是经过粗过滤和活性炭吸附的洁净热空气,样品分室独立存放和干燥,洁净、能避免样品交叉污染。干燥空气温度范围:35±5℃。0.5h翻动1次。</span></p></div><div class="dpu8C _2kCxD " style="max-width: 100%; overflow-x: visible; font-size: 18px; line-height: 30px; color: rgb(34, 34, 34); margin-top: 24px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="overflow-y: auto; max-width: 100%; line-height: 30px; margin-top: 0px !important; margin-bottom: 0px !important; padding: 0px !important;">2.1.2筛分</p></div><div class="dpu8C _2kCxD " style="max-width: 100%; overflow-x: visible; font-size: 18px; line-height: 30px; color: rgb(34, 34, 34); margin-top: 24px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="overflow-y: auto; max-width: 100%; line-height: 30px; margin-top: 0px !important; margin-bottom: 0px !important; padding: 0px !important;">干燥后的土壤样品用玻璃棒磨碎,过20目尼龙筛、筛下物混匀用四分法缩分,至获得所需量样品。用玛瑙研钵研磨至样品全部通过200目筛,装人棕色广口瓶,贴上标签后取样或冷冻保存待用。</p></div><div class="dpu8C _2kCxD " style="max-width: 100%; overflow-x: visible; font-size: 18px; line-height: 30px; color: rgb(34, 34, 34); margin-top: 24px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="overflow-y: auto; max-width: 100%; line-height: 30px; margin-top: 0px !important; margin-bottom: 0px !important; padding: 0px !important;">2.1.3 测定含水率</p></div><div class="dpu8C _2kCxD " style="max-width: 100%; overflow-x: visible; font-size: 18px; line-height: 30px; color: rgb(34, 34, 34); margin-top: 24px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="overflow-y: auto; max-width: 100%; line-height: 30px; margin-top: 0px !important; margin-bottom: 0px !important; padding: 0px !important;">采用国家标准土壤水分测定法( GB7172-87)烘箱法[3分析土壤的含水率,从筛分好的土壤样品中称出5.00 ~ 30.00g 样品2~3份,于已恒重的称量瓶中,放入105±2℃烘箱中烘4h后取出,置于干燥器中冷却后称重。重复烘干0.5h,干燥至怕重。计算含水率。</p></div><div class="dpu8C _2kCxD " style="max-width: 100%; overflow-x: visible; font-size: 18px; line-height: 30px; color: rgb(34, 34, 34); margin-top: 24px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="overflow-y: auto; max-width: 100%; line-height: 30px; margin-top: 0px !important; margin-bottom: 0px !important; padding: 0px !important;">4结论</p></div><div class="dpu8C _2kCxD " style="max-width: 100%; overflow-x: visible; font-size: 18px; line-height: 30px; color: rgb(34, 34, 34); margin-top: 24px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="overflow-y: auto; max-width: 100%; line-height: 30px; margin-top: 0px !important; margin-bottom: 0px !important; padding: 0px !important;">(1)方法平行双样测定的相对标准偏差&lt;20%,质控样的测定结果均在保正值范围内,达到土壤环境监测技术规范( HJ/T166 - 2004)相应的要求;</p></div><div class="dpu8C _2kCxD " style="max-width: 100%; overflow-x: visible; font-size: 18px; line-height: 30px; color: rgb(34, 34, 34); margin-top: 24px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="overflow-y: auto; max-width: 100%; line-height: 30px; margin-top: 0px !important; margin-bottom: 0px !important; padding: 0px !important;">(2)利用土壤干燥技术,可以快速处理不同含水量的土壤样品,可以满足对土壤中重金属元素的测定需要;</p></div><div class="dpu8C _2kCxD " style="max-width: 100%; overflow-x: visible; font-size: 18px; line-height: 30px; color: rgb(34, 34, 34); margin-top: 24px; font-family: arial; white-space: normal; background-color: rgb(255, 255, 255);"><p style="overflow-y: auto; max-width: 100%; line-height: 30px; margin-top: 0px !important; margin-bottom: 0px !important; padding: 0px !important;">(3)该方法为土壤中重金属污染现状调查、污染事故应急调查的分析工作,提供了一种快速准确的分析手段。</p></div><p><br/></p>