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    小张连忙换上笑脸回应:“李叔,王伯,我们就是……就是随便看看,了解一下周边环境,做点调研记录!”他尽量说得轻描淡写。
    “是啊,随便看看。”周辰也笑着点头附和。
    另一位大叔好心提醒道:“行,那你们看归看,可千万小心点!这边堆的都是厂里倒出来的废渣,那边还有块地方是他们烧一些东西的,温度高得很,可别靠近了,烫着!”
    “哎!知道了叔,谢谢您提醒!我们就在边上看看,不往里走!”两人连声应道,谢过几位乡亲,便加快脚步朝着那几根明显的排污沟渠走去。
    越靠近,那股特殊的气味就越明显。小张边走边压低声音,还是有些不解地嘀咕:“辰哥,这儿……有啥好查的?光看也看不出啥啊。而且重金属污染的可能,咱们不是早就用检测数据排除了吗?”
    “有废料处理厂,排放的污染物不一定仅仅是常规认知的重金属,”周辰的目光紧紧锁定在沟渠里流淌的、略显浑浊的废水上,语气冷静地分析道,“可能是其他类型的化学物质,或者某种在特定条件下才会产生毒性的化合物。我们之前的检测,很可能只覆盖了常见的怀疑对象,留下了盲区。”
    说着,他们已经走到了最大的那根排污渠旁边。只见灰黑色的废水正汩汩地从厂区方向流出来,顺着沟渠,蜿蜒向前,而它最终流向的方位……周辰眯起眼睛,根据地形和记忆中的滩涂位置仔细比对,心头猛地一沉——没错!
    这条沟渠的末端,正是那两片出现问题的滩涂的上游方向!废水完全有可能通过渗透、或者潮汐顶托,进入那片滩涂的循环水体!
    “你看!”周辰指着沟渠里的水,对小张说,“水是往那边流的。问题很可能就出在这些水里。”
    他迅速从随身的挎包里,里面常备着一些简易的采样工具和笔记本掏出一个干净的玻璃广口瓶——这是他在农科院学习养成的习惯。他小心翼翼地避开漂浮的杂物,用瓶子在流动的污水中心区域取了一瓶水样。污水看起来浑浊,带着一种不自然的暗色。
    “走,小张,立刻回实验室!马上检测这瓶水样的成分!”周辰盖紧瓶盖,神情严肃。
    两人不再耽搁,拿着这瓶关键的水样,以最快的速度返回了农科院的实验室。陈所长和刘副所长闻讯也立刻赶了过来,神情紧张而期待。
    实验室里,各种检测仪器迅速启动。这一次,检测的目标不再局限于常规的重金属离子和pH值、COD等普通指标。在周辰的强烈建议和提醒下,检测人员扩大了筛查范围,开始有针对性地分析可能来自金属冶炼、选矿过程中使用的各种化学药剂残留,以及废料在堆放、雨淋、甚至可能发生的非正规焚烧过程中,可能产生的复杂化学衍生物。
    时间一分一秒过去,实验室里的气氛凝重而专注。终于,几个小时后,初步的检测报告出来了。
    结果显示,从废料处理厂排污渠取样的水样中,不仅某些重金属离子的浓度虽然未超过一般农用或渔业用水标准,但已经显著高于之前从死亡滩涂取样的背景值,更关键的是
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