水质二氧化氯和亚氯酸盐的测定连续滴定碘量法2

新闻中心

News Center

联系电话：18628242231 13351543065

地址：成都高新区天映路102号一号楼

你的当前位置为：首页 -- 新闻中心 -- 行业动态

水质二氧化氯和亚氯酸盐的测定连续滴定碘量法2

来源:本站发布时间：2018-10-16 18:31:36 浏览次数:3782次

1 适用范围

本标准规定了测定纺织染整工业废水中二氧化氯和亚氯酸盐的连续滴定碘量法。本标准适用于使用亚漂工艺的纺织染整工业排放废水中二氧化氯和亚氯酸盐的测定。当取样量为 150 ml时，二氧化氯的方法检出限为 0.09 mg/L，测定下限为 0.36 mg/L；亚氯酸盐（以亚氯酸根计）的方法检出限为 0.08 mg/L，测定下限为 0.32 mg/L。

2.方法原理

二氧化氯和亚氯酸根在不同 pH值条件下，能氧化碘离子而析出碘。同一个样品，在中性条件下，用硫代硫酸钠溶液滴定二氧化氯与碘离子反应转化为亚氯酸盐时析出的碘，再调节样品 pH值为1～3，用硫代硫酸钠溶液滴定亚氯酸盐与碘离子反应时析出的碘，通过连续滴定来测定二氧化氯和亚氯酸根含量。见反应式（1）和反应式（2）。

ClO2+I−→ClO2-+1/2I2 （1）

HClO2+4HI→2I2+HCl+2H2O （2）

3 干扰和消除

3.1 存在其它含氧氯化物，以及能与 I2 和I-发生氧化、还原反应的物质时，会产生干扰。

3.2 色度对滴定终点会产生干扰。水样有色度时，应取相同水样做为滴定终点判断的参比样品。

4 试剂和材料

除非另有说明，分析时均使用符合国家标准的分析纯化学试剂，实验用水为蒸馏水或去离子水。

4.1 碘化钾（KI）：晶体。

4.2 硫酸：ρ（H2SO4 ）=1.84 g/ml。

4.3 碘酸钾（KIO3 ）：优级纯。使用前，应于 105℃～110℃烘 2 h，置于干燥器内冷却至室温，备用。

4.4 氢氧化钠（NaOH）。

4.5 磷酸二氢钾（KH2PO4 ·2H2O）。

4.6 磷酸氢二钠（Na2HPO4 ·2H2O）。

4.7 硫代硫酸钠（Na2S2O3·5H2O）。

4.8 无水碳酸钠（Na2CO3 ）。

4.9 可溶性淀粉 [(C6H10O5 ) n ] 。

4.10 水杨酸（C7H6O3 ）。

4.11 氯化锌（ZnCl 2 ）。

4.12 硫酸溶液：1+1（v/v），用硫酸（4.2）配制。

4.13 氢氧化钠溶液：c（NaOH）=0.1 mol/L。

称取 4 g氢氧化钠（4.4）溶于少量水中，稀释至 1000 ml。

4.14 缓冲溶液：pH=7。

称取 34.0 g磷酸二氢钾（4.5）和 35.5 g磷酸氢二钠（4.6）于烧杯中，加水溶解后，稀释至 1000 ml。

4.15 碘酸钾标准溶液：c（1/6KIO3 ）=0.0500 mol/L。

称取 1.7835 g（精确至 0.0001 g）碘酸钾（4.3），用水溶解并定容至 1000 ml容量瓶，摇匀。贮存于棕色玻璃试剂瓶中，避光保存。

4.16 硫代硫酸钠标准溶液：c（Na2S2O3 ）≈0.05 mol/L。

上一个：国务院关于修改〈建设项目环境保护管理条例〉的决定

下一个：没有了

返回列表

页面Trace信息

当前页面 : /hangyebiaozhun/201810/6.html
模板缓存 : D:\wamp\chyc/data/front/runtime/cache/5502f2474412663db68d51f8eb97a1a2.php
请求方法 : GET
通信协议 : HTTP/1.1
请求时间 : 2023-05-16 20:51:17
用户代理 : Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.103 Safari/537.36
会话ID : u5f1lua2evfv8e3thf7l4f0d22
日志记录 : 81条日志
[ 2023-05-16T20:51:17+08:00 ] SQL: RunTime:0.021443s SQL = SHOW COLUMNS FROM fangfa_category
[ 2023-05-16T20:51:17+08:00 ] SQL: RunTime:0.000283s SQL = SELECT `catid` FROM `fangfa_category` WHERE `catdir`='hangyebiaozhun' LIMIT 1
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [2048] Only variables should be assigned by reference FbaseAction.class.php 第 69 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined index: forward FbaseAction.class.php 第 70 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [2048] Declaration of ContentModel::add() should be compatible with Model::add($data = '', $options = Array) ContentModel.class.php 第 587 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [2048] Declaration of ContentModel::delete() should be compatible with Model::delete($options = Array) ContentModel.class.php 第 587 行.
[ 2023-05-16T20:51:17+08:00 ] SQL: RunTime:0.011985s SQL = SHOW COLUMNS FROM fangfa_content
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined index: userdata FcontentAction.class.php 第 51 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined index: userdata FcontentAction.class.php 第 51 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8192] mysql_escape_string(): This function is deprecated; use mysql_real_escape_string() instead. DbMysql.class.php 第 400 行.
[ 2023-05-16T20:51:17+08:00 ] SQL: RunTime:0.000300s SQL = SELECT `cid` FROM `fangfa_content` WHERE ( `url` = '201810/6.html' ) AND ( `status` = 9 ) LIMIT 1
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8192] mysql_escape_string(): This function is deprecated; use mysql_real_escape_string() instead. DbMysql.class.php 第 400 行.
[ 2023-05-16T20:51:17+08:00 ] SQL: RunTime:0.000352s SQL = SELECT * FROM `fangfa_content` WHERE ( `url` = '201810/6.html' ) LIMIT 1
[ 2023-05-16T20:51:17+08:00 ] SQL: RunTime:0.010509s SQL = SHOW COLUMNS FROM fangfa_content_article
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8192] mysql_escape_string(): This function is deprecated; use mysql_real_escape_string() instead. DbMysql.class.php 第 400 行.
[ 2023-05-16T20:51:17+08:00 ] SQL: RunTime:0.000293s SQL = SELECT * FROM `fangfa_content_article` WHERE ( `cid` = '6' ) LIMIT 1
[ 2023-05-16T20:51:17+08:00 ] SQL: RunTime:0.011325s SQL = SHOW COLUMNS FROM fangfa_model_field
[ 2023-05-16T20:51:17+08:00 ] SQL: RunTime:0.000337s SQL = SELECT `fieldid` FROM `fangfa_model_field` WHERE `status`='1' AND `modelid`='1'
[ 2023-05-16T20:51:17+08:00 ] SQL: RunTime:0.010666s SQL = SHOW COLUMNS FROM fangfa_content_tag
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8192] mysql_escape_string(): This function is deprecated; use mysql_real_escape_string() instead. DbMysql.class.php 第 400 行.
[ 2023-05-16T20:51:17+08:00 ] SQL: RunTime:0.000200s SQL = SELECT fangfa_tag.name FROM `fangfa_content_tag` LEFT JOIN fangfa_tag ON (fangfa_tag.tagid=fangfa_content_tag.tagid) WHERE ( fangfa_content_tag.keyid = 'c-6' ) ORDER BY fangfa_tag.tagid DESC
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [2] Invalid argument supplied for foreach() ContentModel.class.php 第 448 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined variable: value Field.class.php 第 203 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined variable: value Field.class.php 第 201 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined variable: value Field.class.php 第 201 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [2] strpos(): Empty needle ThumbField.class.php 第 21 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined variable: value Field.class.php 第 201 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined variable: value Field.class.php 第 201 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined variable: value Field.class.php 第 201 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined variable: value Field.class.php 第 201 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined variable: value Field.class.php 第 201 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined index: p FbaseAction.class.php 第 262 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined index: p FbaseAction.class.php 第 262 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined index: p FbaseAction.class.php 第 262 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined index: p FbaseAction.class.php 第 262 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined index: p FbaseAction.class.php 第 262 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined index: p FbaseAction.class.php 第 262 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined index: p FbaseAction.class.php 第 262 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined index: p FbaseAction.class.php 第 262 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined index: p FbaseAction.class.php 第 262 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined index: p FbaseAction.class.php 第 262 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined index: p FbaseAction.class.php 第 262 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined index: p FbaseAction.class.php 第 262 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined index: p FbaseAction.class.php 第 262 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined index: p FbaseAction.class.php 第 262 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined index: p FbaseAction.class.php 第 262 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined index: p FbaseAction.class.php 第 262 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined index: p FbaseAction.class.php 第 262 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined index: p FbaseAction.class.php 第 262 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined index: p FbaseAction.class.php 第 262 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined index: p FbaseAction.class.php 第 262 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined index: p FbaseAction.class.php 第 262 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined index: p FbaseAction.class.php 第 262 行.
[ 2023-05-16T20:51:17+08:00 ] SQL: RunTime:0.011130s SQL = SHOW COLUMNS FROM fangfa_comment
[ 2023-05-16T20:51:17+08:00 ] SQL: RunTime:0.000193s SQL = SELECT COUNT(*) AS tp_count FROM `fangfa_comment` WHERE newsid =6 and status=1 LIMIT 1
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined index: content FcontentAction.class.php 第 149 行.
[ 2023-05-16T20:51:17+08:00 ] SQL: RunTime:0.000163s SQL = SELECT * FROM `fangfa_comment` WHERE newsid =6 and status=1 ORDER BY id DESC
[ 2023-05-16T20:51:17+08:00 ] SQL: RunTime:0.005491s SQL = SHOW COLUMNS FROM fangfa_content
[ 2023-05-16T20:51:17+08:00 ] SQL: RunTime:0.000444s SQL = SELECT * FROM `fangfa_content` WHERE ((`cid` > 6 and `sort`=1 ) or `sort`<1) and `status` = 9 and `catid`=22 ORDER BY sort desc,cid asc LIMIT 1
[ 2023-05-16T20:51:17+08:00 ] SQL: RunTime:0.000347s SQL = SELECT * FROM `fangfa_content` WHERE ((`cid` < 6 and `sort`=1 )or `sort`>1) and `status` = 9 and `catid`=22 ORDER BY sort asc,cid DESC LIMIT 1
[ 2023-05-16T20:51:17+08:00 ] SQL: RunTime:0.010785s SQL = SHOW COLUMNS FROM fangfa_content_count
[ 2023-05-16T20:51:17+08:00 ] SQL: RunTime:0.000264s SQL = SELECT * FROM `fangfa_content_count` WHERE `cid` = 6 LIMIT 1
[ 2023-05-16T20:51:17+08:00 ] SQL: RunTime:0.000226s SQL = UPDATE `fangfa_content_count` SET `hits`=3783 WHERE cid='6'
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [2048] Declaration of RelationModel::_after_insert() should be compatible with Model::_after_insert($data, $options) RelationModel.class.php 第 415 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [2048] Declaration of CategoryModel::_after_insert() should be compatible with Model::_after_insert($data, $options) CategoryModel.class.php 第 15 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [2048] Declaration of CategoryModel::add() should be compatible with Model::add($data = '', $options = Array) CategoryModel.class.php 第 15 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [2048] Declaration of CategoryModel::save() should be compatible with Model::save($data = '', $options = Array) CategoryModel.class.php 第 15 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [2048] Declaration of CategoryModel::delete() should be compatible with Model::delete($options = Array) CategoryModel.class.php 第 15 行.
[ 2023-05-16T20:51:17+08:00 ] SQL: RunTime:0.005352s SQL = SHOW COLUMNS FROM fangfa_category
[ 2023-05-16T20:51:17+08:00 ] SQL: RunTime:0.000293s SQL = SELECT `catid` FROM `fangfa_category` WHERE ( `catid` IN (1,2,3,4,5,6,40) ) AND ( `isshow` = 1 ) ORDER BY `sort` ASC
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined index: child %%62^622^622796EB%%article_view.html.php 第 46 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined index: child %%62^622^622796EB%%article_view.html.php 第 46 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined index: child %%62^622^622796EB%%article_view.html.php 第 46 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [2] Missing argument 1 for Ad::__construct(), called in D:\wamp\chyc\include\library\ThinkPHP\Common\functions.php on line 259 and defined Ad.class.php 第 40 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [2] Missing argument 2 for Ad::__construct(), called in D:\wamp\chyc\include\library\ThinkPHP\Common\functions.php on line 259 and defined Ad.class.php 第 40 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined variable: type Ad.class.php 第 41 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined variable: setting Ad.class.php 第 42 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [2] Invalid argument supplied for foreach() function.ffcategory.php 第 84 行.
[ 2023-05-16T20:51:17+08:00 ] NOTIC: [8] Undefined variable: pagesize function.fflink.php 第 26 行.
[ 2023-05-16T20:51:17+08:00 ] SQL: RunTime:0.012416s SQL = SHOW COLUMNS FROM fangfa_friendlink
[ 2023-05-16T20:51:17+08:00 ] SQL: RunTime:0.000319s SQL = SELECT * FROM `fangfa_friendlink` WHERE ( `status` = 1 ) ORDER BY created DESC
加载文件 : 90
[0] => D:\wamp\chyc\index.php
[1] => D:\wamp\chyc\define.php
[2] => D:\wamp\chyc\include\library\ThinkPHP\ThinkPHP.php
[3] => D:\wamp\chyc\include\library\ThinkPHP\Common\runtime.php
[4] => D:\wamp\chyc\include\library\ThinkPHP\Common\defines.php
[5] => D:\wamp\chyc\front\Conf\paths.php
[6] => D:\wamp\chyc\front\Conf\core.php
[7] => D:\wamp\chyc\include\library\ThinkPHP\Common\functions.php
[8] => D:\wamp\chyc\include\library\ThinkPHP\Lib\Think\Core\Think.class.php
[9] => D:\wamp\chyc\include\library\ThinkPHP\Lib\Think\Exception\ThinkException.class.php
[10] => D:\wamp\chyc\include\library\ThinkPHP\Lib\Think\Core\Log.class.php
[11] => D:\wamp\chyc\include\library\ThinkPHP\Lib\Think\Core\App.class.php
[12] => D:\wamp\chyc\include\library\ThinkPHP\Lib\Think\Core\Action.class.php
[13] => D:\wamp\chyc\include\library\ThinkPHP\Lib\Think\Core\View.class.php
[14] => D:\wamp\chyc\front\Common\alias.php
[15] => D:\wamp\chyc\include\library\ThinkPHP\Common\convention.php
[16] => D:\wamp\chyc\front\Conf\config.php
[17] => D:\wamp\chyc\data\config.inc.php
[18] => D:\wamp\chyc\data\config.cache.php
[19] => D:\wamp\chyc\front\Common\common.php
[20] => D:\wamp\chyc\front\Conf\routes.php
[21] => D:\wamp\chyc\front\Conf\tags.php
[22] => D:\wamp\chyc\include\library\ThinkPHP\Common\debug.php
[23] => D:\wamp\chyc\include\library\ThinkPHP\Lib\Think\Core\Model.class.php
[24] => D:\wamp\chyc\include\library\ThinkPHP\Lib\Think\Db\Db.class.php
[25] => D:\wamp\chyc\include\library\ThinkPHP\Lib\Think\Db\Driver\DbMysql.class.php
[26] => D:\wamp\chyc\data\cache\category_22.php
[27] => D:\wamp\chyc\include\library\ThinkPHP\Lang\zh-cn.php
[28] => D:\wamp\chyc\front\Lib\Action\FcontentAction.class.php
[29] => D:\wamp\chyc\front\Lib\Action\FbaseAction.class.php
[30] => D:\wamp\chyc\include\library\ThinkPHP\Lib\ORG\Util\Input.class.php
[31] => D:\wamp\chyc\front\Lib\Model\ContentextModel.class.php
[32] => D:\wamp\chyc\admin\Lib\Model\ContentModel.class.php
[33] => D:\wamp\chyc\include\Pager.class.php
[34] => D:\wamp\chyc\data\cache\model_1.php
[35] => D:\wamp\chyc\data\cache\modelField_1.php
[36] => D:\wamp\chyc\data\cache\modelField_2.php
[37] => D:\wamp\chyc\data\cache\modelField_3.php
[38] => D:\wamp\chyc\data\cache\modelField_5.php
[39] => D:\wamp\chyc\data\cache\modelField_6.php
[40] => D:\wamp\chyc\data\cache\modelField_7.php
[41] => D:\wamp\chyc\data\cache\modelField_8.php
[42] => D:\wamp\chyc\data\cache\modelField_9.php
[43] => D:\wamp\chyc\data\cache\modelField_10.php
[44] => D:\wamp\chyc\data\cache\modelField_11.php
[45] => D:\wamp\chyc\data\cache\modelField_12.php
[46] => D:\wamp\chyc\data\cache\modelField_13.php
[47] => D:\wamp\chyc\data\cache\modelField_14.php
[48] => D:\wamp\chyc\data\cache\modelField_15.php
[49] => D:\wamp\chyc\data\cache\modelField_16.php
[50] => D:\wamp\chyc\data\cache\modelField_20.php
[51] => D:\wamp\chyc\data\cache\modelField_21.php
[52] => D:\wamp\chyc\include\Field.class.php
[53] => D:\wamp\chyc\include\field\CatidField.class.php
[54] => D:\wamp\chyc\include\field\TitleField.class.php
[55] => D:\wamp\chyc\include\field\InputField.class.php
[56] => D:\wamp\chyc\include\field\ThumbField.class.php
[57] => D:\wamp\chyc\include\field\AttrField.class.php
[58] => D:\wamp\chyc\include\field\TextareaField.class.php
[59] => D:\wamp\chyc\include\field\EditorField.class.php
[60] => D:\wamp\chyc\include\field\BoxField.class.php
[61] => D:\wamp\chyc\include\field\TagField.class.php
[62] => D:\wamp\chyc\include\field\DatetimeField.class.php
[63] => D:\wamp\chyc\include\library\ThinkPHP\Lib\ORG\Util\Page.class.php
[64] => D:\wamp\chyc\include\library\ThinkPHP\Lib\Think\Util\Template\TemplateSmarty.class.php
[65] => D:\wamp\chyc\include\Smarty\Smarty.class.php
[66] => D:\wamp\chyc\data\front\runtime\templates_c\%%62^622^622796EB%%article_view.html.php
[67] => D:\wamp\chyc\include\Smarty\internals\core.load_plugins.php
[68] => D:\wamp\chyc\include\Smarty\internals\core.assemble_plugin_filepath.php
[69] => D:\wamp\chyc\include\tag\function.ffcategory.php
[70] => D:\wamp\chyc\include\tag\function.ffgetpage.php
[71] => D:\wamp\chyc\include\tag\function.ffad.php
[72] => D:\wamp\chyc\include\tag\function.ffset.php
[73] => D:\wamp\chyc\include\Smarty\internals\core.get_include_path.php
[74] => D:\wamp\chyc\data\front\runtime\templates_c\%%0C^0C5^0C52E3C7%%header.html.php
[75] => D:\wamp\chyc\admin\Lib\Model\CategoryModel.class.php
[76] => D:\wamp\chyc\include\library\ThinkPHP\Lib\Think\Core\Model\RelationModel.class.php
[77] => D:\wamp\chyc\data\cache\category_1.php
[78] => D:\wamp\chyc\data\cache\category_2.php
[79] => D:\wamp\chyc\data\cache\category_3.php
[80] => D:\wamp\chyc\data\cache\category_4.php
[81] => D:\wamp\chyc\data\cache\category_5.php
[82] => D:\wamp\chyc\data\cache\category_6.php
[83] => D:\wamp\chyc\data\cache\category_40.php
[84] => D:\wamp\chyc\data\cache\category_20.php
[85] => D:\wamp\chyc\data\cache\category_26.php
[86] => D:\wamp\chyc\data\ads\ad_1.php
[87] => D:\wamp\chyc\include\Ad.class.php
[88] => D:\wamp\chyc\data\front\runtime\templates_c\%%FD^FD7^FD7FB2B1%%footer.html.php
[89] => D:\wamp\chyc\include\tag\function.fflink.php

南宫2.8官网

水质 二氧化氯和亚氯酸盐的测定 连续滴定碘量法2

水质二氧化氯和亚氯酸盐的测定连续滴定碘量法2