XIII, A, 1 Heise and Behrynan: Water Analysis in Field 5 



allowed to stand for ten minutes, with frequent shakings. The 

 turbidity produced is then determined with the turbidimeter as 

 before. The sulphate content (as parts per million of SO,) is 

 read from Table III. 



■Table III. — Converting readings in depths by the turbidimeter into parts 

 per million of sulphate. 



Reading 

 in centi- 

 meters. 



Parts per 

 million 

 (asSOs). 



Reading: 

 in centi- 

 meters. 



Parts per 

 million 

 (asSOa). 



Reading 

 in centi- 

 meters. 



Parts per 

 million 

 (asSOs). 



1.0 



522 



5.4 



104 



10.8 



53 



1.1 



478 



5.5 



103 



11.0 



52 



1.2 



442 



5.6 



101 



11.2 



51 



L3 



410 



5.7 



99 



11.4 



50 



1.4 



383 



5.8 



97 



11.6 



49 



1.6 



359 



5.9 



96 



11.8 



48 



l.« 



338 



6.0 



94 



12.0 



47 



1.7 



319 



6.1 



93 



12.4 



46 



1.8 



302 



6.2 



91 



12.6 



46 



1.9 



287 



6.3 



90 



12.8 



44 



2.0 



273 



6.4 



88 



13.0 



43 



2.1 



261 



6.5 



87 



13.5 



42 



2.2 



250 



6.6 



86 



14.0 



41 



2.3 



239 



6.7 



84 



14.5 



39 



2.4 



230 



6.8 



83 



15.0 



38 



2.5 



221 



6.9 



82 



15.5 



37 



2.6 



213 



7.0 



81 



16.0 



36 



2.7 



205 



7.1 



80 



16.5 



35 



2.8 



198 



7.2 



79 



17.0 



34 



2.9 



191 



7.3 



78 



17.5 



33 



3.0 



185 



7.4 



77 



18.0 



32 



3.1 



179 



7.5 



76 



18.5 



31 



3.2 



173 



7.6 



76 



19.0 



30 



3.3 



168 



7.7 



74 



20.0 



29 . 



3.4 



164 



7.8 



73 



21.0 



28 



3.5 



159 



7.9 



72 



22.0 



27 



3.6 



155 



8.0 



71 



22.5 



26 



3.7 



151 



8.1 



70 



23.0 



25 



3.8 



147 



8.2 



69 



24.0 



24 



3.9 



144 



8.3 



68 



25.0 



23 



4.0 



140 



8.5 



67 



26.5 



22 



4.1 



137 



8.6 



66 



28.0 



21 



4.2 



133 



8.7 



65 



29.0 



20 



4.3 



131 



8.8 



64 



31.0 



19 



4.4 



128 



9.0 



63 



33.0 



18 



4.5 



125 



9.1 



62 



35.0 



17 



4.6 



122 



9.3 



61 



37.5 



16 



4.7 



119 



9.5 



, 60 



40.0 



15 



4.8 



117 



9.7 



59 



43.0 



14 



4.9 



115 



9.8 



58 



28.5 



13 



5.0 



113 



10.0 



57 



50.0 



12 



6.1 



110 



10.2 



56 



55.5 



11 



5.2 



108 



10.4 



55 



62.0 



10 



5.3 



106 



10.6 



54 



68.0 



1 



9 



