Standard Test Method for Sulfate Ion in Water
水中硫酸根离子标准试验方法
1. Scope
1．范围
1.1 This turbidimetric test method covers the determination of sulfate in water in the range from 1 to 40 mg/L of sulfate ion (S042-).
1．1 这个浊度的测试方法包括了水中硫酸盐在1～40mg/l范围内的硫酸根离子（S042－）的确定。 aabc式词语大全
1.2 This test method was ud successfully with drinking, ground, and surface waters. It is the ur's responsibility to ensure the validity of this test method for waters of untested matrices高中化学方程式.
1．2 这个试样方法被成功的应用在饮用水，地下水和地表水。确保这个试验方法的有效性是使用者的职责。
1.3 Former gravimetric and volumetric test methods have been discontinued. Refer to Appendix X1 for historical information.
幼儿园纪录片
1．3 先前的重量和体积的试验方法已经被废止。相关的历史信息见附录X1.
1.4 This standard does not purport to address the safety concerns, if any, associated with its u. It is the responsibility of the ur of this standard to establish appropriate .safety and health practices and determine the applicability of regulatory limitations prior to u.
这个标准不能提供
2. Referenced Documents
2．相关的文件
2.1 ASTM Standards
2.1 ASTM标准
D 1066 Practice for Sampling Stcam2
D I 129 Terminology Relating to Water2
D 1192 Specification for Equipment for Sampling Water and Steam in Clod Conduits2
捡起的拼音 D 1193 Specification for Reagent Water雌激素药物有哪些2
D 2777 Practice for Determination of Precision and Bias of Applicable Methods of Committee D-19 on Water2
D 3370 Practices for Sampling Water from Clod Conduits2
D 5847 Practice for Writing Quality Control Specifications for Standard Test Methods of Water Analysis3
E 60 Practice for Photometric and Spectrophotometric Methods for the Chemical Analysi
s of Metals4
E 275 Practice for Describing and Measuring Performance of Ultraviolet, Visible, and Near Infrared Spectrophotometerss
3. Terminology
3．术语
3.1 Definitions-For definitions of terms ud in this test method, refer to Terminology D 1129.
3．1 定义――对于用于这个试验方法的术语定义，请见术语学 D1129。
4. Summary of Test Method.
4．试验概述
4.1 Sulfate ion is converted to a barium sulfate suspension under controlled conditions. A
solution containing glycerin and sodium chloride is added to stabilize the suspension and minimize interferences. The resulting turbidity is determined by a nephelometer, spectrophotometer, or photoelectric colorimeter and compared to a curve prepared from standard sulfate solutions.
信守承诺的意思4．1对于受控制的条件下硫酸钡悬浊液，硫酸根离子是可修改的。一份包含甘油和氯化钠的溶液被加到里面，用来稳定悬着物和最小化干涉。用浊度计，分光光度计，或者光电比色计确定混浊度的结果，对比一条已经从标准的硫酸盐溶液准备好的曲线。
5. Significance and U
5．意义和利用
5.1 The determination of sulfate is important becau it has been reported that when this ion is prent in excess of about 250 mg/L in drinking water, it caus a cathartic action (especially in children) in the prence of sodium and magnesium, and gives a bad taste to the water.
5．1 硫酸盐的确定是很重要的，因为它已经被报道，当这种离子（以钠盐和镁盐形式出现）在饮用水中含量超过大约250 mg/l时，它将引起一个导泻作用（尤其是在孩子身上），并且对于水有一种不好的滋味。
6. Interferences
6．干涉
6.1 Insoluble suspended matter in the sample must be removed. Dark colors that can not be compensated for in the procedure interfere with the measurement of suspended barium sulfate (BaS04).
6数学建模论文模板．1 试样中不能溶解的悬浮的物质必须被分离。在这个步骤中，不能被补偿的黑颜色会干扰硫酸钡悬着液的测定。
6.2 Polyphosphates as low as 1 mg/L will inhibit barium sulfate precipitation causing a negative interference.
6.2 象1 mg/L一样低的多磷酸盐将阻止硫酸钡沉淀，由负干涉引起。
Phosphonates prent in low concentrations, depending on the type of phosphonate, will also cau a negative interference.
磷酸盐在低浓度的凝聚物中存在情况（取决于磷酸盐的种类），仍然由负干涉引起。
Silica in excess of 500 mg/L may precipitate along with the barium sulfate causing a positive interference.
超过500 mg/L的二氧化硅可以随着硫酸钡沉淀而沉淀，由正干涉引起。
Chloride in excess of 5000 mg/L will cau a negative interference.
超过5000 mg/L的氯化物将引起负干涉。
Aluminum, polymers, and large quantities of organic material prent in the test sample may cau the barium sulfate to precipitate nonunifonnly.
存在于试验样品中的铝化物，高分子材料和大量的有机物，可以引起硫酸钡不均匀的沉淀。
In the prence of organic matter certain bacteria may reduce sulfate to sulfide. 美丽的冬天图画
有机物中某种细菌的存在，可以还原硫酸盐到硫化物。
To minimize the action of sulfate reducing bacteria, samples should be refrigerated at 4℃ when the prence of such bacteria is suspected.
为了最小化由细菌还原硫酸盐的作用，当样品种被怀疑有这样的细菌存在时，样品应该冷却在4℃。
6.3 Although other ions normally found in water do not appear to interfere, the formation of the barium sulfate suspension is very critical.
Determinations that are in doubt may be checked by a gravimetric method in some cas, or by the procedure suggested in Note 2.
